Hosting user-generated content in general is a mug's game these days. I wouldn't even consider launching a new startup in this space now and it's only going to

Hosting user-generated content in general is a mug's game these days. I wouldn't even consider launching a new startup in this space now and it's only going to get worse as the regulatory hammer comes down. I'm not a fan of Facebook at all but a lot of their current troubles are intrinsic to any platform that lets people post whatever they want.