What would you pay for on a social network?
One-time account payment to keep spammers (mostly) at bay.40w reply +¹
I would pay to avoid datamining. I'm not exactly sure how this would work, but if there is a membership fee, I would pay for myself and for friends to be able to join me. (ie. a paid account which sponsors free accounts.) Something like Metafilter also seems interesting, but I've never gotten around to checking it out.43w reply +¹