Here's one I haven't seen mentioned: social network fatigue. People gradually realize that online friendships tend to be shallow, unfulfilling & transitory. The

Here's one I haven't seen mentioned: social network fatigue. People gradually realize that online friendships tend to be shallow, unfulfilling & transitory. They switch back to the old model where being somebody's friend actually takes some effort, and has tangible emotional and social benefits associated with it. FB becomes irrelevant. Cf. that Wilson Quarterly article that was on here a couple days ago. Hey... anything is possible :-)