Facebook, the fourth largest Web property in the US, attracted some 157.2 million visitors in May 2011, an all-time high and a gain of 3.2 million visitors over the previous month, according to data from comScore Media Metrix.
MySpace, meanwhile, continued to lose audience share during the month, to 34.8 million unique visitors. Although the site still holds the No. 2 spot among social networking sites, MySpace audiences have fallen nearly 50% from May-2010 levels, while average user engagement has dropped 85%.
Once synonymous with leading-edge music and pop culture, MySpace reached its peak in December 2008, attracting 75.9 million monthly unique visitors in the US.