I met Mono on POF of all places. He was looking for a hook up, we got talking about my very open profile, he wasn't interested and was paranoid and then came back and said he couldn't stop looking at my picture and thought we should meet anyway, no hook up necessary (Although he was secretly hoping he would get laid anyway
I met Derby at a poly discussion group locally.
I met Leo on POF also. He is a swinger and we have a non-sexual relationship that is very loving, romantic and deep regardless.
Yup, anything is possible.
I suggest that if you want to meet like minded people that you create it for yourself. I would start a group or join a group of poly people in your area. The way to meet people is to go out there and meet them.... no attachment to romance, but just to get the ball rolling in terms of finding friends.