MySpace still topped the social networking site category with the most monthly unique visitors, according to IDATE. That number grew from 66.4 million in June 2006 to 114.1 million in June 2007, but slipped to 109.3 million in June 2008, SFN's World Digital Media Trends 2009 reported.

Facebook had 13.1 million unique visitors in June 2006, but surged to 52.5 million one year later, and then continued to almost double to more than 100 million in June 2008, according to IDATE.

Other players had much fewer unique visitors - Hi5 had 38.3 million in June 2008, while Friendster and Orkut had 34.1 million and 26.9 million, respectively. Bebo reported 22.4 unique visitors in June 2008, according to the report, World Digital Media Trends 2009, released by SFN and the World Association of Newspapers and News Publishers.