Klout scrapes social network data and creates profiles on individuals and assigns them a “Klout score”. Klout currently claims to have built more than 100 million profiles. Klout is not an “opt-in” service, but individuals who register at Klout can ensure that all of their social networks are accessed and therefore evaluated in their Klout scores. Klout also builds profiles of individuals who are connected to those who do register at Klout.
Here is a brief report: