r/TheoryOfReddit - Did Digg make us the dumb? How have reddit comments changed in length and quality since it was formed? Which subreddits are the smartest? Do SDD drives fail as often as traditional drives? Find out all this and more (many graphs inside).

Great start at research on reading level, slang, comment length, and celebrity obsession on the main reddit.com as well as broken down by subreddit. You can see reddit get dumber as it ages and grows. Unsurprisingly non-default subs like philosophy, truereddit, and canada come out the best.