The ability to move as a unified dynamic in the ways that reddit has makes it different from the Diggs before its time. It's a culture now, be it elitist or self-entitled. There is a massively diverse web of subs and opinions, even though most ideas are smothered by the hivemind of whatever current mentality reddit has, they can still be found, and preserved in their own subs for example. I agree that the aggregator concept isn't unique, but you can fall in love with reddit, and another site has yet to connect like that, at least to me. Edit: to clarify on the unity concept, whether reddit is right or wrong about something, it has the ability to take a ridiculous number of people, from all over the world, and make them move as one; to think as one. That's pretty powerful.