I'm not into social media for various reasons. But the main one is that I just don't have the time and energy for it. Keeping up to date with online news, blog commentary and then writing my own blogs is already too much for me. So I just don't understand how people can do all that and participate enthusiastically in sites like Twiiter and Facebook as well.
Maybe it's a generation thing. Perhaps oldies like me (I'm 45) just don't have the mental flexibility that youngsters who grew up in the age of the internet have.
Whatever the reason, it does seem that people are starting to overdose on sites like these. The term "social media burnout" does get a lot of results with those exact keywords in page titles. So clearly more and more people are suffering from this.