A survey by Pew Internet research in February 2013 found that 67% of all US Internet users regularly visited social media sites; for those aged 18-29, this was closer to 90%.
What’s the Score? A Guide to Social Media Influence Scoring

Social media scoring systems – detailing the workings of Klout, PeerIndex and Kred, what benefits they may bring to digital marketing and the potential privacy fallout.