Actually, funny, my psychiatrist brought this up the other day, and suggested a site called meetup.org (might be dot com). It's just for meeting up with people with similar interests and hobbies, non-romantic, can be people of either gender. Usually activity centered. I'm trying to find a riding partner, a guy about my age with similar goals and abilities, to train with evenings, early mornings, and weekends, both/either mountain/rough trail or road. So far, nothing too promising, all of the cycling groups are too far away to be practical, but I'm going to keep trying.