A set of 1.4 million biomedical papers was analyzed with
regards to how often articles are mentioned on Twitter or saved by users on
Mendeley. While Twitter is a microblogging platform used by a general
audience to distribute information, Mendeley is a reference manager targeted
at an academic user group to organize scholarly literature. Both platforms
are used as sources for so-called “altmetrics” to measure a new kind of
research impact. This analysis shows in how far they differ and compare to
traditional citation impact metrics based on a large set of PubMed papers.