Reverse job boards seem an interesting concept to me. I get the feeling that they shouldn't be niche (IE: Django focused) but instead be general so people can

Reverse job boards seem an interesting concept to me. I get the feeling that they shouldn't be niche (IE: Django focused) but instead be general so people can see what else the profile can do, and get as many "ways in" as possible. I've thought about having a general nature reverse job board, where people can post what they want to do, so that someone who's trying to bring together a team can browse and pick and choose people to message. (Ie: I want to make a photography startup so I want to talk with people who know photos). Does anything like that exist? I know there's LinkedIn but that falls under social media, I can't look at it seriously enough as a job board.