I received an invite from a friend to "join him on Twitter". Thing is, I'm not a big social network fan, I don't have a FB account and I've never been near Twitter. I've been thinking about this and trying not to notice the "Still waiting for you..." emails. I guess I should let him know either way, but would like to know what I'm letting myself in for, should I accept. What was your experiences and impressions of Twitter? Is it as bad as FB?