If you see something, say something. It's a slogan that has been put to use in a lot of places since 9/11. And it's now being used by YouTube to urge its members to report terrorist training films and other videos by extremist groups.
The site has launched a new set of policies to ban terror training videos as well as videos on things like how to make bombs and footage of sniper attacks.
The Internet has become a powerful tool for recruiting terrorists. The site is relying on its users to report objectionable clips. It's estimated that 13 hours of new video is uploaded to the YouTube site every few minutes.