According to the timestamp on the file of this screenshot, this happened in the beginning of September of 2011. Since then, we've seen the emergence of people like BritishEnglishPolice. He happens to be a moderator in over 160 reddits, most of which are extremely popular.
We've also seen the destruction of Karmanaut, and the revelation that karmanaut is in fact several people and that the people behind karmanaut have multiple other accounts. These accounts have been seen having conversations with each other, fueling the typical reddit circlejerk for karma that happens in the comments section. Karmanaut's other account was "probablyhittingonyou" and it was established that they were the same person.
The most staggering coup of all sub reddits seems to be /r/lgbt. Suddenly, the moderation staff becomes extremely hostile towards its users and starts to push an agenda. I have absolutely no evidence that they are working for anything associated with the Reddit staff, but it's yet another example of a small group of users making a move to dominate control of a sub reddit.