My friend Tex, a regular at Dragon's Keep, is on Facebook. We friended each other, and then about a week later I got a Facebook message from him de-friending me.
"Sorry, man. You tweet so often I can never see anybody else's updates because they've scrolled off the bottom."
This, believe it or not, is the very first time anybody has told me they can't be my friend because I talk too much.
So I explained to Tex that he can hide my updates by checking a little box. This way he can tune me out and still be my friend.
(Note: I suspect that this is what all my friends do in real-life.)