YouTube Employees

Have you ever been browsing the Internet and clicked on a link from say, YouTube and it says that the video or song has been deleted? I'm sure all of us have, but recently I was curious as to how big of a department YouTube has whose main goal is to make sure all videos are appropriate and comply with copyright rules. I did some research and it says that about 24 hours of video is uploaded every minute to YouTube. That's more than I ever imagined and can't possibly picture how many people there are to make sure everything that is uploaded is okay. It seems like a daunting task, but quite necessary for the company. In addition, I was curious as to how long it would take YouTube to take down a video that someone reports. Clearly, YouTube has figured this all out, I would just be curious as to what the actual numbers are.