Burensasub
It's true: an online community does need some growth so it won't wither away. I guess what I wanted to say is that the growth that Facebook and Twitter experienced is unlikely to ever happen again...nor would we want it to. For a while there were would-be Facebook competitors but most creators of online communities have given that up. Many people, disillusioned with Facebook want a smaller online community so there's a good chance many of them, like Subreply, will survive.