…when the ISP’s are selling your browsing data direct to the advertisers anyway. If you are a BT, VirginMedia or Carphone Warehouse customer who values your privacy I suggest you start looking for proxy anonymizers. Anonymizer.com and proxify.com are well known ones but I can’t vouch for any of them.
I have found that people like to get onto facebook / youtube / myspace when they are at work. So the simple way to do that if it is blocked is just to unblock it with a facebook / youtube / myspace proxy. You can always find new ones if yours gets blocked.