@Padme
For me, it was Okcupid and furries.
Though, I deleted my Okcupid profile earlier this year because somehow I kept attracting D/s kinksters and the male Dom would send his fem sub to try to draw me into their thing, which is not my thing.

The furries are all over the place with gender, sexuality, lifestyles, etc but there seems to be a good proportion of poly furs. Also I'm a furry so it's my "home" subculture.