Social Networks - A Novelty

I remember, in early '90s when the first wave of techies went to the US, on H VISA, the first thing that most used to do was to start forwarding emails with jokes, to a long list of recipients. I guess, easy access to internet and email was something that led to people doing that. It probably was also a way to keep in touch. Over a period of time, novelty wore off and email chains, with jokes, stopped. I am wondering, if social media is also going thru' the same phase. People are experimenting with it. All sort of things get written, get shared, from trivia to very thoughtful. I reckon, over a period of time fatigue will set in, just like the joke emails, the usage of social networks for exchanging trivia will reduce. Anyone buying this line of reasoning? :)