Comment by chipotle_coyote

There was an attempt a few years ago to do just this. Remember Imzy? If the answer is "no," you're probably not alone; it shut down after only two years of operation. They didn't have any of the problems that we're discussing here, as far as I remember. (Personally, I suspect its extremely weird and confusing UX design was at least part of what did it in; I found its navigation so baffling I gave up pretty quickly.)