Like lots of PP's have said, I recognise most of the names of the people who have posted in this thread. I don't remember much about what you have posted or responded to though, unless it was something that really resonated with me or astounded me (good or bad) or I found interesting (as in "wow... how about that!")... if that makes sense.
As for my own visibility/invisibility ... I wouldn't have a clue. I guess I don't get alot of comments on stuff I post but I don't do alot of posting either. Had never really thought about it much until now.