Yeah, I've had this problem as well. Part of the issue is, I really like reading and talking about "the issues of the day" (politics, etc.). But it's hard to find an online community that meets all the requirements I'd have to feel good about engaging, like:

1. mostly respectful

2. relatively optimistic in terms of looking for solutions rather than simply venting about how terrible the world is

3. willing to listen to arguments and ideas that don't match their own

4. Not so far away from my own positions that we simply cannot communicate productively (e.g., there's only so much time I can spend arguing with even well-meaning and polite objectivists)