What is post-publication peer review? Types, platforms, and benefits

Jump to Contents

• What is post-publication peer review?
• A brief history of post-publication peer review
• Complementing traditional peer review
• Encouraging a culture of transparency and accountability
• Helping publishers maintain the accuracy of the scientific record
• Low engagement
• Fragmented reviews and lack of standardization
• Potential for misuse of the review process
• Types of post-publication peer review
• Platform comparison: where PPPR happens
• How to participate in post-publication peer review
• Best practices for effective PPPR comments
• Who should participate in PPPR and why
• Frequently asked questions about post-publication peer review

Is publication really the final chapter in a research paper’s journey? Not quite. In many ways, it’s just the beginning of a new phase—post-publication peer review (PPPR). This is when the wider research community jumps in, sparking discussion and adding another layer of scrutiny. While traditional peer review is still the gold standard, PPPR is gaining recognition for good reasons. For starters, it usually offers quicker feedback. It’s often open and public too, which means more researchers from a diverse pool can weigh in. That’s a big plus, especially given the common complaints about traditional peer review being slow and lacking diversity in its reviewer pool.

What is post-publication peer review?

Post-publication peer review (PPPR) is the ongoing evaluation of a published research article by the wider scientific community, after it has cleared a journal’s formal review process. Unlike traditional peer review, which is conducted by a small number of invited experts before publication, PPPR is open to any qualified researcher and can happen at any point in a paper’s life.

Its core purpose is to extend scrutiny beyond what a handful of pre-publication reviewers can reasonably catch, identifying errors, flagging potential misconduct, and enriching scientific dialogue.

Whether it’s Letters to the Editor, social media threads, or platforms like PubPeer and F1000 Research, PPPR has become a valuable part of the research conversation. These channels have even helped uncover flaws in published work in the past. And in a time when misinformation is rampant and public trust in science is under pressure, increased transparency, even after publication, is more important than ever.

A brief history of post-publication peer review

Post-publication peer review is not a new idea — its roots predate the internet. What has changed dramatically is the infrastructure that makes it practical at scale.

1665: Early journals

Letters to editors of the Philosophical Transactions of the Royal Society allowed readers to critique published work: an informal precursor to PPPR.

1970s–80s: Letters to the editor formalised

Most major journals institutionalised correspondence sections as the primary channel for post-publication criticism, but access was tightly gatekept by editors.

2006: Nature’s experiment

Nature trialled open peer review alongside its traditional process; low participation rates were widely cited, but the experiment sparked serious debate about alternatives to closed review.

2012: F1000Research launches

F1000Research introduced a publish-then-review model, making post-publication peer review the formal mechanism rather than an add-on.

2012: PubPeer goes live

PubPeer launched as a standalone platform for anonymous, article-level commentary: quickly becoming the primary venue for flagging misconduct and data errors in published literature.

2014: STAP cell scandal

Social media and PubPeer discussions surfaced fatal methodological flaws in a high-profile Nature paper within weeks of publication, leading to retraction. This became a landmark demonstration of PPPR’s real-world power.

2020: COVID-19 accelerates PPPR

The pandemic made rapid post-publication scrutiny of preprints and published findings a matter of public health urgency, mainstreaming PPPR for non-specialist audiences.

2023–present: AI-assisted review

Emerging tools use automated analysis to flag statistical anomalies, image duplications, and citation errors in published papers at scale: extending PPPR beyond human bandwidth.

Complementing traditional peer review

Unlike traditional peer review, PPPR allows for an ongoing assessment of the published work by a broader range of experts, identifying flaws, errors, or potential integrity concerns that may have been overlooked during the initial review, which usually involves just a handful of experts. PPPR can also encourage interdisciplinary conversation, with the diverse perspectives of researchers from across fields adding more value and helping strengthen the research. This ongoing feedback doesn’t just boost credibility—it also encourages a more collaborative and open research culture.

Encouraging a culture of transparency and accountability

PPPR offers a way to promote transparency in a publishing system which is seen as being closed. By encouraging open discussions and corrections, PPPR allows for ongoing scrutiny and assessment of published research and enhances the credibility of the journal content. Moreover, if combined with other elements like preprints and the disclosure of reviewer reports, PPPR has the potential to become more impactful and add transparency at multiple stages. This approach can not only enhance accountability among researchers and publishers but also build trust among readers, enhancing the standing of the journal within the academic community.

 Helping publishers maintain the accuracy of the scientific record

By facilitating ongoing and dynamic evaluations of research long after its publication, open discussions, like those enabled by PPPR, can help journals in determining the need to issue errata, corrections, or retractions, to ensure the accuracy of their record. Publishers can also leverage insights from PPPR cases to reinforce safeguards set to prevent misconduct in the future, upholding journal credibility. Furthermore, PPPR platforms can create dynamic spaces for researchers and publishers to refine findings and address concerns in a collaborative way and improve author-publisher relationships, keeping authors and the community at the center of research communication and dissemination.

Opening up space for post-publication commentary can go a long way in building public trust. It helps make editorial updates more transparent and efficient, supports safe whistleblowing, and encourages better use of evidence synthesis. It also creates room for good faith collaboration—something that really matters when time is critical, like we saw during the COVID-19 pandemic. But while this kind of system has real benefits, it’s not without its hurdles. Let’s take a look at some of the challenges that come with PPPR.

 Low engagement

One of the main challenges PPPR faces is low engagement, with a limited number of researchers or reviewers providing feedback after publication. Scientists often juggle demanding workloads, and they may not be very motivated to engage in PPPR, especially when their feedback goes unrecognized or unaddressed. When participation is limited, it can undermine the effectiveness of PPPR in enhancing research quality. To encourage participation, publishers can simplify the review process, making it easier for researchers to participate and incentivize the process by recognizing reviewers for their contributions. For example, on ScienceOpen, reviewer contributions are recognized by assigning a DOl upon publication, and since reviewers are linked through their ORCID, this creates a verifiable record of their peer review activities.

 Fragmented reviews and lack of standardization

Another challenge is the fragmentation of PPPR discussions across various platforms, with some comments even being missed. Additionally, the informal nature of some platforms can lead to inconsistent review quality. These issues often arise from the lack of comprehensiveness and interoperability, causing different platforms to provide varied types of commentary on articles—some even discussing the same work without a more standardized method for accessing this information. Publishers can play a crucial role in creating a more cohesive and organized system. For example, ScienceOpen has collaborated with prominent organizations like Crossref and ORCID to ensure that PPPR on its platform works seamlessly and without conflicts.

 Potential for misuse of the review process

Despite well-intentioned researchers looking for and providing valuable feedback, the PPPR process is susceptible to trolling, which can lead to confrontations in public forums. As a counter to this negative element, having a system with accountability as its core feature could help reduce harsh comments and offer a more inclusive environment for research participation. Anonymity is another factor to consider. While anonymity may encourage spamming or unprofessional comments, removing anonymity might deter some researchers, particularly those in junior roles, from openly critiquing the work of their more senior counterparts for fear of potential repercussions. So, the question of whether open or anonymous PPPR is more effective remains, and different platforms may have different approaches. PubPeer, for example, gives users the option to comment anonymously or with their real names. While ScienceOpen takes a stricter route, requiring commenters to verify their identity through an ORCID profile. Users must have at least one publication to leave a comment, and five to post full reviews or ratings.

The strain on the publishing system, combined with the growing complexity of fraudulent research practices, has revealed the cracks in the current state of peer review. The question remains—how can we reimagine peer review to meet the demands of modern science without losing its rigor? To navigate the changing landscape of scholarly publishing, which has its own distinct challenges, the academic community may need to embrace and explore innovative review models. PPPR offers an approach that not only enhances research integrity but also bolsters accountability and transparency, enables community involvement, and speeds up the publication process. PPPR practices could also create a more resilient system and foster greater collaboration within the research community.

Types of post-publication peer review

The term “post-publication peer review” is used loosely across publishing, but it actually refers to several distinct models that differ in who can participate, how formal the process is, and what happens as a result of the review.

Type 1: Invited post-publication review (publisher-driven)

The article is published online first (after an editorial check), and then formally reviewed by invited experts selected by the journal. Reviews are published openly alongside the article, and the article’s status changes once it passes review.

• Used by: F1000Research, Copernicus journals
• Reviewer identity: named and credited
• Outcome: article indexed in databases only after passing review
• Best for: ensuring all articles receive expert scrutiny

Type 2: Volunteer open review (publisher-driven)

Articles are published first and reviewed by self-selected volunteer reviewers, subject to eligibility criteria set by the platform. The review process is open but not guaranteed for every article.

• Used by: ScienceOpen, The Winnower
• Reviewer identity: verified (e.g., ORCID, minimum publication threshold)
• Outcome: reviews published on the article page; article status may or may not change
• Best for: broadening reviewer diversity beyond editor networks

Type 3: Third-party platform commentary (independent)

Anyone can comment on any published article via platforms that operate independently of journals. This is the most open and most informal type — and the one most associated with misconduct detection.

• Used by: PubPeer, ResearchGate (comments), social media
• Reviewer identity: anonymous or pseudonymous options available
• Outcome: no formal change to article status; journal editors may act on flagged concerns
• Best for: community scrutiny, whistleblowing, rapid error identification

Type 4: Structured letters and journal commentary

Traditional journals publish Letters to the Editor, technical comments, or correspondence sections as a formal post-publication mechanism. This is the oldest form of PPPR and remains the most widely recognised by journals.

• Used by: most major journals (NEJM, Nature, BMJ, etc.)
• Reviewer identity: named authors, subject to editorial acceptance
• Outcome: published as a citable record; authors may publish a response
• Best for: formal academic debate and corrections of the scholarly record

Platform comparison: where PPPR happens

✓ = yes   ✗ = no   ~ = partial / varies by article

How to participate in post-publication peer review

Whether you are a seasoned researcher or an early-career reviewer, PPPR is more accessible than traditional peer review. The following steps apply whether you want to leave a comment on PubPeer, submit a formal review on ScienceOpen, or write a Letter to the Editor.

1. Choose your platform

Match the platform to your goal. Use PubPeer for flagging errors, ScienceOpen for citable reviews, or Letters to the Editor for formal academic commentary.

2. Set up your profile

Create an ORCID profile if you do not already have one. Most platforms use ORCID for identity verification and to link reviews to your publication record.

3. Read the full paper

Do not rely on the abstract. Review the methodology, data, statistical analysis, and supplementary materials. Check cited sources for accuracy and relevance.

4. Draft your comment

Be specific, evidence-based, and constructive. Cite sources to support your critique. Raise one issue per comment to keep the discussion focused and actionable.

5. Submit and disclose

Declare any conflicts of interest before submitting. If your institution or funder has a relationship to the authors or topic, disclose it, even in informal settings.

6. Engage with responses

PPPR works best as a dialogue. Respond to author replies in good faith and update your comments if new evidence changes your assessment.

Best practices for effective PPPR comments

Who should participate in PPPR and why

• Early-career researchers: PPPR is one of the few ways to build a visible, citable reviewing record before joining a journal’s formal reviewer pool. ScienceOpen and Publons both create verifiable records linked to ORCID.
• Interdisciplinary researchers: You may catch methodological gaps that specialists in a single field overlook, especially in cross-disciplinary studies.
• Clinicians and applied scientists: If published findings affect practice, PPPR is a legitimate channel to flag translation gaps between bench and bedside.
• Statisticians and data scientists: Statistical errors are among the most common and consequential issues in published research, and among the least likely to be caught by non-specialist reviewers.

Frequently asked questions about post-publication peer review

1. My paper has received a comment on PubPeer. What should I do?

Receiving a PubPeer notification can feel alarming, but how you respond matters far more than the comment itself. The first step is to read it carefully and without defensiveness. Many comments are factual observations about figures, statistics, or data, not accusations of misconduct.

As a general approach:

• If the comment raises a genuine error (a mislabelled figure, a calculation mistake), contact your journal’s editor promptly to discuss a correction. Acting quickly demonstrates good faith and protects your reputation far better than silence.
• If the comment reflects a misunderstanding, you can respond directly on PubPeer. Respond calmly, factually, and with evidence. PubPeer notifies you by email and gives you the opportunity to post a reply linked to your ORCID.
• If the comment appears to be bad-faith or defamatory, document it and consult your institution’s research integrity office before taking any public action. Seeking legal recourse against anonymous commenters is legally complex. One high-profile lawsuit (Sarkar v. PubPeer) was dismissed on appeal, with the Michigan court ruling that anonymous peer commentary is protected speech.
• Do not ignore comments. Unanswered threads can attract further scrutiny, and some journals now actively monitor PubPeer discussions linked to their published articles.

Key point: A comment on PubPeer does not automatically trigger a journal investigation or retraction. Journals are not obligated to act, but many now monitor these platforms and may reach out if concerns are substantive or appear valid to the journal editor.

2. Does post-publication peer review actually lead to retractions and corrections, or is it mostly noise?

The evidence is clear that PPPR, particularly via PubPeer, has directly contributed to corrections and retractions in high-profile journals. Notable examples include:

• The 2014 STAP cell papers in Nature: fatal flaws were identified by the PPPR community within weeks of publication, ultimately leading to retraction.
• A 2017 paper in Science on cellulose fibre fabrication received an expression of concern within days of publication after an expert flagged issues in the supplementary data via journal channels.
• Multiple corrections in PNAS, Current Biology, and Journal of Cell Science have been directly attributed to PubPeer comment threads.

However, the pipeline from comment to formal action is slow and inconsistent. A 2021 study found that over two-thirds of PubPeer comments report some form of potential misconduct, primarily image manipulation, yet a substantial proportion of flagged papers remain uncorrected years later. Journals vary widely in how responsive they are to community feedback; some track PubPeer dashboards actively, while others have stated policies of not acting on comments from “public websites.”

Important caveat: PPPR is most effective when comments are specific, evidence-based, and focused on verifiable observations. Vague or polarizing comments rarely move journals to act.

3. Is there a legal risk to leaving critical comments on a published paper?

Yes, legal risk exists but it has so far been limited in practice. The principal concern is defamation: if a commenter makes claims that are false, presented as fact, and damage the reputation of an identifiable researcher, the author of that paper could, in theory, pursue legal action.

For US researchers, the key legal precedent in this area is the Sarkar v. PubPeer case, in which a cancer researcher sued PubPeer’s anonymous commenters, alleging their comments cost him a faculty job offer. The Michigan Court of Appeals ultimately ruled in PubPeer’s favour, finding that the comments constituted protected scientific speech. PubPeer has since redesigned its infrastructure to make it technically impossible for the platform to reveal commenter identities.

Practical guidance to minimise legal risk:

• Frame observations as factual descriptions, not conclusions. (“Figure 2B and Figure 4A appear to contain identical banding patterns” rather than “the authors fabricated this figure.”)
• Avoid language that implies deliberate fraud unless you have direct, verifiable evidence.
• Cite publicly available data, prior publications, or reproducible analysis to support your observations.
• Researchers in countries outside the US face different legal environments. However, if you have followed the above guidelines, you are unlikely to face a severe legal risk.

Bottom line: Factual, evidence-based, and professionally phrased comments carry very low legal risk in most jurisdictions. The risk lies in making conclusive allegations of fraud without evidence, or in comments that can be read as personal attacks rather than scientific critique.

4. Can AI tools be used for post-publication peer review, and are they reliable?

AI-assisted PPPR is one of the fastest-growing areas in research integrity, and several tools are already operational. Unlike human reviewers, AI systems can analyse thousands of papers simultaneously and flag statistical anomalies or image duplications that would take years to detect manually.

Current AI applications in PPPR include:

• Image forensics: Tools like ImageTwin and Proofig scan figures for duplication, manipulation, or reuse across papers. This is one of the most common forms of misconduct flagged on PubPeer.
• Statistical error detection: The GRIM test (Granularity-Related Inconsistency of Means) and SPRITE can automatically flag reported statistics that are mathematically impossible given the described sample sizes. These have been applied programmatically to large corpuses of psychology and medicine papers.
• Reference and citation checking: AI tools can detect hallucinated references, citation rings, and self-citation anomalies at scale.
• Text similarity and plagiarism detection: Beyond commercial tools like iThenticate, AI models can detect paraphrased duplication that traditional tools miss.

However, AI tools also have serious limitations: AI tools generate false positives, struggle with context-dependent interpretation, and cannot assess whether a scientific conclusion is valid. AI-flagged concerns should always be verified by a human expert before being submitted as PPPR comments.

Emerging standard: Several publishers and preprint servers are beginning to run AI integrity checks at submission like Paperpal’s Preflight. This represents a convergence of pre- and post-publication review, and may substantially change how manuscripts are evaluated in coming years.

5. Does participating in PPPR count toward academic credit or career advancement?

This is one of the most frequently cited barriers to widespread PPPR adoption: the academic incentive structure does not yet formally reward post-publication review in the way it rewards authorship, grants, or invited peer review.

That said, the landscape is improving. Specific platforms and initiatives now offer concrete recognition:

• ScienceOpen assigns a DOI to every published review, making it a citable, permanently archived contribution linked to the reviewer’s ORCID profile.
• Publons (now part of Web of Science) allows researchers to log and display review activity, including some PPPR contributions, on a verified profile that can be shared with institutions and grant bodies.
• F1000Research formally credits named invited reviewers, who appear alongside the article and whose reviews carry the same DOI infrastructure as the article itself.
• Some universities and funders (particularly in Europe) are beginning to incorporate open peer review contributions into hiring and promotion criteria as part of the broader Open Science and Research Assessment Reform movements, such as the Coalition for Advancing Research Assessment (CoARA).

For most researchers today, PPPR contributions are best understood as reputational investments rather than formal credits. PPPR serves to demonstrate expertise, visible intellectual engagement, and a record of contributing to scientific integrity. For early-career researchers building a reviewer profile, the citable-DOI route via ScienceOpen is currently the most concrete path to tangible recognition.

Trend to watch: As institutions adopt broader research assessment frameworks that move beyond the h-index and journal impact factor, PPPR contributions are increasingly likely to be formally recognised. Several European funding bodies already treat open review activity as a positive indicator in grant applications.

This article was originally published on April 7, 2025, and updated on June 13, 2026.