Users are getting a lot more selective, deleting comments, photo tags, and even friends at a record rate, according to a new study released Friday by the Pew Internet and American Life Project.

Pew is calling this phenomenon "the pruning" of social networks, and the study includes findings like this: 63 percent of users have unfriended people from their friends users. Another 44 percent have deleted comments made by others from their profile page, and 37 percent have removed tags from photos.

"Social network users are becoming more active in pruning and managing their accounts," says the report, written by Mary Madden, senior research specialist at Pew.