There are some bandwidth sapping sites that you should not let your users visit, especially at work. These are sites like facebook.com, youtube.com, p*rn.com, s3x.com. Truth be told, what do these sites contribute to an employee’s productivity? Nothing!!!
So,here is how you can block them and save your bandwidth for more important things like emails,skype, etc. Watch the video. You can find the code after the vidoe
For multiple sites at once do this ^.+(facebook.com|youtube.com|twitter.com).*$