Gawker/Kinja - and specifically Jalopnik.com - seemed to have figured out how to build community in the comments. They simply have the author review them in batch form before they make it to the public.
If the system was really perfect, they wouldn't have had to start requiring a login to post as AC.
Nearly. Not "really." The tragedy of the commons is not solvable. I accept that, and slashdot made it trivial to read without seeing those shit posts. It was probably just filling up their database with racist and faciast novels.
Jalopnik has it's fair share of memes and repetitive in-jokes (BMW blinkers, Mustangs hopping curbs). But there are are also some pretty insightful and knowledgeable threads. I've seen a couple of technical comments on certain vehicles that I'm absolutely convinced were written by an engineer that designed that vehicle.