Altmetrics are non-traditional, Social Web-based measures of the reach and influence of scholarly output. Some examples of altmetrics are downloads, bookmarks, blog posts, shares, and citation indexes.
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Several publishers include altmetric data for their journals, including the American Chemical Society, PLoS, and Wiley. Open access archives (such as ArXiv) and Institutional Research Repositories also now contain this type of article level metrics. An Altmetric Bookmarklet (once installed) is available to capture this data in Google Scholar.