[SamBorick]

...Friends?

Probably internet friends if you have niche interests. But yeah, you're not going to get high quality discussions on arbitrary topics from strangers.

[cnees]

Seriously, though. And if friends aren't around enough, you may wish to upgrade to a deluxe perma-friend, that is, a spouse. :D

[passion__desire]

There was Aadvark search engine startup which google acquired which used to route questions to probable subject matter experts or willing participants. Maybe something similar could work.