PLoS new hub is another way to create a dynamic and interactive community in is specialized topic. Register users will be able to rate, annotate and discuss articles.
"Currently, the PLoS Hub for Clinical Trials features articles originally published in PLoS Clinical Trials, along with clinical trials articles from PLoS ONE.
In the future, this new resource will expand to include articles from all the PLoS titles that publish clinical trials. It will also feature open-access articles from other journals plus user-generated content." via bbmg