Unique Visitors to Social Networking Sites and Ad Spend on Social Networking Sites

Ranking of Top Social Networking Sites by Unique Visitors

Source: Clickz

U.S. Online Social Networking Revenues 2006-2011

Worldwide Online Social Networking Spend 2006 - 2011



U.S. Teen Online Social Networking Users 2006 - 2011



U.S. Adult Online Social Network Users 2006 - 2011

Source: eMarketer