Currently just this one.
My first experience with an online forum, which was also very positive, was a fitness forum... my first, "OMG, I'm really traveling across several states to meet people from the internet

" experience. A great gathering with wonderful people, and more get-togethers followed and friendships grew. But then, inexplicably, the "old school" posters fell away and the forum began to die. And though it has been somewhat resurrected, it is nowhere near the thriving community it once was, which is sad to me.

I hope it never happens to this one!