First there was Slashdot, but CmdrTaco insisted on picking the stories for us. He called it an "omelet". Kuro5hin came along to fix this, but discouraged posts that were just links to pages elsewhere on the web. IIRC, this was called "link farming". How many users had the talent and time to create original content, and then survive the ridiculous Kuro5shin editing process? Not many. Digg then encouraged links, but sh…
Outsourcing moderation and libertarian ideals all sound nice, but when the rubber hits the road it gradually chases normal people away. Reddit just did it it slower because the strengths of their platform and content overwhelmed it... but it's getting there eventually.