Somewhat off-topic, but if you're curious, here's a heat map that I made of Reddit's submission activity: http://i.imgur.com/ur18gQa.png
I'm currently working on downloading all of Reddit's link submissions for data analyses (one such analysis is published here: http://minimaxir.com/2013/09/reddit-imgur-youtube/). So far, I have about 20M links downloaded...and that's not even a year's worth of data.
I'm using the /all/new.json feed, which can pagenate an unlimited number of entries. (using a /<subreddit>/.json feed will only let you go back 1,000 entries total for that subreddit)
