We have a 5520, with the CSC, though without the Plus license.
We would like to block Facebook chat, without blocking the rest of Facebook.
A bunch of searching has turned up the following 3 URLs to block, so I put them into the CSC under URL Blocking.
This is supposed to prevent outgoing messages, prevent a user from seeing other facebook users, and prevent incoming messages.
However, it doesn't do anything. As well, the places where I've seen this referenced have a following message to the effect that "this no longer works."
Facebook's support hasn't answered any requests for information on how to block chat at the firewall, just telling us how to block chat as individuals, which doesn't help.
Does anyone have any ideas? Anyone else done this?