Klout is adding more channels by which it will measure social influence: Blogger, Tumblr, Flickr, Instagram and Last.fm now join a lineup that consists of Twitter, Facebook, LinkedIn, YouTube, and most recently Foursquare.
Klout has been growing in influence, with a high score considered a badge of honor (some people reportedly include it on their resumes). As illustration, last month when Spotify opened its doors in the U.S., it partnered with Klout to offer Free account invitations.
Facebook Still Rules
It is interesting that Klout is expanding the metrics it uses to rate social influence. However, there is little doubt that Facebook remains the biggest player in this universe. The number of unique US visitors to Facebook.com is roughly 2.5 times the combined number of unique visitors to MySpace and Twitter.com, according to comScore. Facebook has almost 160 million unique US visitors, while MySpace has a little less than 40 million and Twitter has a little more than 20 million.