PlumX is a subscription-based platform for tracking research impact. PlumX gathers and brings together appropriate metrics for all types of scholarly research output.
They categorize metrics into 5 separate types: Usage, Captures, Mentions, Social Media, and Citations.
Examples of each type are:
Usage – clicks, downloads, views, library holdings, video plays
Captures – bookmarks, code forks, favorites, readers, watchers
Mentions – blog posts, comments, reviews, Wikipedia links
Social media – +1s, likes, shares, tweets
Citations – citation indexes, patent citations, clinical citations