This may be all random, paranoid stuff but this is what I just gathered:
On [this video](http://www.youtube.com/watch?v=KBGoX0d1HVA) he states that the anniversary is April 14th and something terrible happened on May 10th.
The first video ever on the site is April 14th, 2010
On May 9th, he posted a whole shitload of stuff, then went dark for a week, the last video being: ["the"](http://www.youtube.com/watch?v=dQdEwFdQcqU). He came back May 16th with the post of ["letters."](http://www.youtube.com/watch?v=H854w9M2bxg)
On September 12 of 2010, he started posting all of the letters of the alphabet with [Aa](http://www.youtube.com/watch?v=IJvept23aHc)