[2] Lithium Technologies, who acquired the site in March 2014, closed the service on May 25, 2018,[3][4] the same day the European General Data Protection Regulation came into force.

This information was combined with data from a number of other social network followings and interactions to come up with the Klout Score.

[8] Other accounts such as Flickr, Blogger, Tumblr, Last.fm, and WordPress could also be linked by users, but they did not weigh into the Klout Score.

[10] Amplification score relates to the likelihood that one's messages will generate actions, such as retweets, mentions, likes and comments.

While it was claimed that advanced machine learning techniques were used, leveraging network theory, Sean Golliher analysed Klout scores of Twitter users and found that the simple logarithm of the number of followers was sufficient to explain 95% of the variance.

Pulling data from Twitter’s API, he created a prototype that would assign users a score out of 100 to measure their influence.

While Klout users who had received Perks were under no obligation to write about them, the hope was that they will effectively advertise the products on social media.