The Pew Research Center found that about two-thirds of social networking users questioned in the Spring of 2011 said they had deleted people from their "friend" lists, up from 56 percent in 2009. An additional 44 percent said they had deleted comments others had made on their profiles, up from 36 percent two years before.
The Obama administration last week called for a "privacy bill of rights" that would give users more control over their data.
Fifty-eight percent of those surveyed by Pew said their main profile was set to be private so that only friends could get access. Another 19 percent said their profile was partially private.