Most people who have used Twitter have received the question/statement, "why would anyone ever use it? No one cares what I ate for lunch today." I particularly liked
this answer for Crooked Timber, "By the way, if you neither like nor understand Twitter, that's perfectly OK: no-one is making you follow anyone."
Basically, who cares who cares if you care? Or, in a slightly less cryptic way, what's the difference if anyone is listening or not you're enjoying yourself?
Anyway, I've said this before when asked if I had advice for grasping what's going on online: Go screw around. If you don't like what's happening, that's totally cool, at least you've got your own opinion. I think it's a much better way to be.