Video compression and Rick rolling in youtube.

Over a beer last evening, we were musing about whether youtube uses ensemble compression to account for redundancy in video submissions. Specifically this came up while looking for the lonely island 'on a boat' rick roll to nail a friend, when we realized the vast quantity of google videos with that one clip. If all the rick rolling videos were ensemble compressed, the famous clip would only have to be stored once, as opposed to the thousands of times it is currently probably stored on the Google servers. In addition to this and all the troll songs, charlie the unicorn clips, and other memes, this would definitely save a lot of disk space.