​Altmetrics = alternatives (to traditional) metrics that include social bookmarking (Mendeley, CiteULike), academic blogs, and social media mentions.  

Scopus provides a suite of altmetrics for each article provided by PlumX (see below) and a number of publishers are now including altmetric information on the article's web page.  You can also download the Altmetric.com bookmarklet (example at right) to find altmetrics for any article on a web page that includes a DOI.  Altmetric information allows you to click through to the source of social media mentions.

For more information on altmetrics and why you might want to collect them, see What are Altmetrics?