Nobody knows what they are or what they're for. There are many theories revolving around what their use could be. The most common and accepted possibility is that these are videos are a type of code that needs to be deciphered. http://www.bbc.co.uk/news/technology-27238332 77,000 videos is quite a lot.
That is some weird shit- I thought it was just some obsessive but if there's something behind it then that's quite interesting.