New survey results also show that among adults 18 and older, Facebook has taken over as the social network of choice; 73% of adult profile owners use Facebook, 48% have a profile on MySpace and 14% use LinkedIn

A new report, based on a survey and a series of focus groups conducted by the Pew Internet & American Life Project examine how teens, particularly those with profiles online, make decisions about disclosing or shielding personal information.