Klout was a website and mobile app that used social media analytics to rate its users according to online social influence via the "Klout Score", which was a numerical value between 1 and 100. In determining the user score, Klout measured the size of a user's social media network and correlated the content created to measure how other users interact with that content. Klout launched in 2008.
Lithium Technologies, who acquired the site in March 2014, closed the service on May 25, 2018.
Klout used Bing, Facebook, Foursquare, Google+, Instagram, LinkedIn (individuals' pages, not corporate/business), Twitter (now X), Wikipedia, and YouTube data to create Klout user profiles that were assigned a "Klout Score". Klout scores ranged from 1 to 100, with higher scores corresponding to a higher ranking of the breadth and strength of one's online social influence. While all Twitter users were assigned a score, users who registered at Klout could link multiple social networks, of which network data was then aggregated to influence the user's Klout Score.
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