User-submitted content aggregators are a fairly popular method of creating a cohesive community out of scratch. From the olden days of newsgroups, to Slashdot, to Digg before the fall, allowing users to find or create their own content and submit it at their leisure can end up creating a surprisingly informed community with lightning-fast updates. Of course, that can also lead to a bunch of superfluous garbage, but a few communities out there are able to surpass that hurdle. More often than not, reddit tends to be one of the few examples of a user-submitted content aggregating community. If you aren’t hip to reddit yet, or are the hippest of cool cats but want to brush up on your history, Sortable created an informative infographic full of information and graphics just for you, seen below the break.