Also, if you wanted to block YOUTUBE, you would have to block every single IP address that YOUTUBE has, which could be up to 50? or more.. but it can be done..
You can point your PIX to an external Websence server for URL filtering or upgrade to Cisco ASA 5505 and higher and you can use the inspect policies to filter on application layer content.
if you have an IOS device capable of NBAR, you can use it to match on url strings and block traffic that way. it's crude, but it works easily.
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