I don't remember PoF being famous for that, but they got a lot of bang for the buck on their serving costs.

What I do remember, is that it was a social data collection experiment for a couple of social scientists, that never originally expected that many people would actually find ways to find each other and hook up using it.

I miss their old findings reports about how weird humans are and what they lie about. Now, it's just plain boring with no insights released to the public.