Posted by Adam Ostrow
Specifically, 55.6 million adults – or just less than 1/3rd of the population – in the US now visit social networks at least monthly, according to a new report from Forrester Research. That’s up from just 15 percent of adults in 2007, and around 18 percent last year.
Read article here
http://mashable.com/2009/07/28/social-networking-users-us
