Earlier quoted context omitted.
reddit is an echo chamber even worse than here. i dread depending on its platform for any content
Reddit is actually the most powerful facebook-alternative in existence today. And I mean alternative in the sense of "community for online conversations" and not necessarily, "place to post baby pictures". The sort of political and organizing power reddit has shown recently (say, with the SOPA campaign) is not thinkable on facebook or google+. An AMA on reddit has also become a required stop for actors/directors/auth…
now, if you want to start to discuss effectivenes instead of size, take a look at slashcode voting system.