This, and blocking similar instant messaging products, are a hot topic for which there isn't a complete and simple solution. You could attempt to do so, and perhaps be moderately successful, but from a practical standpoint, this isn't possible. The use of http port 80 is part of the difficulty. Some have resorted to blocking the IP addresses of messaging servers, but this changes. The short answer on this is to block use of any instant messenger you need a security policy banning it, and the to move to content filtering that may provide protection for those who continue to violate the policy. This affords some protection.
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