As Facebook users change the way they behave, the social network company will need to stay nimble to protect revenue.
Amanda Borland, a sophomore at the University of Southern California, sits at her computer scrolling through a list of names. Suddenly she stops and clicks on a picture. “That is a random person I have never talked to,” she says. In an instant, Borland “unfriends” another Facebook contact. Borland originally added these people while running for student government in high school; now she sees no reason to keep them as friends.