If you are really into it that kind, just make a subreddit in Reddit. You're just going to fill in the blanks on the fields needed to start such subs.
It is at least the thing that could meet your needs if you're really into it. Invite your friends to it so you could discuss 'who is satoshi' and all those conspiracy theories you could think of.

Otherwise, there's not much option you have since that is simply just a megathread topic like mk4 mentioned.