I think 2 different things are being mentioned: ONLY referring to some one by a singular and identifiable first name only and using a first name in a casual sense after id has been established.
If the op meant the 2nd circumstance, i stand by my opinion....discussion boards are no different then having a casual conversation. Nothing wrong with famiarity amongst "us". Yes, in publications, it is certainly different. In talking to my friends, I'm never going to refer to Patrick Page as Mr. Page. If I were writing a review that was going to be published, I would.
We are not a professional setting here.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.