Do we have any idea how many members are actually active say since the start of December? I look at some profiles and realise that that person has written nothing for a year or even more.
I joined about a year and a half ago (I think) and posted some comments right after that, but hadn't posted anything until recently. I've discovered some other groups that I've gotten to be pretty active in, so I'm a regular now. But I don't post every day either.