In general I don't agree. Maybe in a B2B setting you can do this. Do you have an example where this has worked? I can only think of many examples where it wouldn't have worked. Do I want a website where I can make friends with my real friends? No, what for, we'll just hang out in real life? Do I want a service where I can post 140 character messages to the world? Only 140 characters? What's the point of that? Do I want to be able to stay in other people's houses while they are away? No way, that's crazy, nobody would go for that over a hotel... (I happily use all these services now, of course).