The Altmetric bookmarklet is a free tool provided by Altmetrics that allows you to locate altmetric data for articles in arXiv, PubMed and any other article with a digital object identifier (DOI).
Tips for using the bookmarklet tool:
Altmetric data is provided for individual articles by several journal publishers and databases. These include Wiley, Elsevier, Springer, Taylor & Francis, and EBSCO-hosted databases. These publishers may provide this data using a major data provider (e.g. Plum, Altmetric) or track this data internally.
Here are some example of altmetric data for two articles, one in a Taylor & Francis journal and another in found in EBSCO-hosted database: