The current description of Chat- "Sites where you can chat in real-time with groups of people. Includes IRC and video chat sites." more or less encompasses all of Instant Messaging.
Chat should refer to sites that operate chat rooms, or their video equivalent, where strangers can connect.
Instant messaging is about communication between people with preexisting connections and shared contact information, whether personal or within an organization.
Under the current definition, AOL Instant Messenger and it's web site AIM.com is understandably blocked, but in practical terms it ought to be distinguished from IRC or sites like chatroulette,com.
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