Everybody knows aboutKickstarter. That's just the start. These platforms have gone global, and are giving the opportunity to participate in and change projects, rather than just fund them. 
It's part of a new movement thattrendwatching.com's latest reportcalls 'Presuming.' 
Joining a community, finding great stories, and following a product all the way through to its production allows a consumer experience long before the product ships.