I've read through this thread with great interest, and have decided to make a contribution to it, so here goes, (slightly nervous about how it will be received).
I'm not sure how many members GN has now, but I'm sure it runs into thousands. Of that number I could name only about ten with any certainty and that's because they either post regularly, have such warm and caring natures, can offer specialised advice, or have an attitude (you can agree with me or you can be wrong) that grates. I don't often post but love this forum and find it sad that it can degenerate into schoolyard jibes. Surely we are all old enough to live and let live?
It can feel a bit cliquey, especially when you see one poster ask a question and they will be told that they will be pm'd. I agree with Jingle that in some ways that facility is not such a good idea, although obviously it has it's place.