This is awesome, we were doing the same thing for a bit at first but ultimately moved away from it in favor of focusing on a product more in our wheel house, but I think this has a lot of potential to be very big. Very much rooting for you!

One thought we had that was different was to let users create communities but auto populate the communities with links that we've crawled, to solve the link gaming issue. And then let them choose how things would be ranked and curate the links we auto populated.