  This paper analyzes Altmetric.com, one of the most important altmetric data
providers currently used. We have analyzed a set of publications with DOI
number indexed in the Web of Science during the period 2011-2013 and collected
their data with the Altmetric API. 19% of the original set of papers was
retrieved from Altmetric.com including some altmetric data. We identified 16
different social media sources from which Altmetric.com retrieves data. However
five of them cover 95.5% of the total set. Twitter (87.1%) and Mendeley (64.8%)
have the highest coverage. We conclude that Altmetric.com is a transparent,
rich and accurate tool for altmetric data. Nevertheless, there are still
potential limitations on its exhaustiveness as well as on the selection of
social media sources that need further research.
