PubMed had an own comments feature “PubMed Commons” which had been shut down in 2018.
NIH announced it will be discontinuing the service — which allowed only signed comments from authors with papers indexed in PubMed, among other restrictions — after more than four years, due to a lack of interest.
But there is no lack of interest, if we look at the ever increasing rates at PubPeer – the counter today is 122.000.
The main difference between PubMed Commons and PubPeer is the chance of submitting anonymous comments. While I also see a risk of unjustified accusations or online stalking, I believe that the current PubPeer coordinators handle this issue very well. We can post only issues that are obvious, directly visible or backed up by another source. Continue reading PubPeer should be merged into Pubmed (at some time point)