If you don't pass this letter to everyone on your buddy list, we will delete your account
That sounds very suspiciously like a chain letter to me. XD
Besides, every file that is uploaded to youtube gets converted with some codec called Sorenson Spark H.263 (you can look it up on wikipedia), therefore you couldn't infect your computer even if you wanted.
Thanks to everyone who wished me a Happy Birthday earlier.
Sorry for not replying, it's been kinda hard to get on the internet lately.