It’s nice and tidy; alphabetized, and covers everything from art to aviation to fashion to goth to music to travel to writing, and seriously everything in between. There are also reviews of many of the sites included.
Frankly I’m stunned that there are so many social niche networks out there right now. Actually, maybe I’m more stunned that someone gathered them up in one place. The list will be updated and tweaked as time goes on, so bookmarking is a good plan.
Check it out and then go fourth and network to your little heart’s content.