PloS recently initiated a program to provide metrics for individual articles published in all PLoS journals. This program focuses on the impact of the article itself instead of the journal and includes metrics for assessing the impact of the article by using indicators such as cited-by citations, social bookmarks, blog coverage, to name a few.

“. . .article-level metrics will attempt to capture the actions and opinions of entire communities of readers to give a rich and sophisticated picture of research impact that will be helpful to authors and readers alike. Readers may then frame that picture in the context of their particular field and their own work.”

For more information on Assessment of Research Impact, see Assessing the Impact of Research.