I wonder if it is possible to make a log where it will show if users are trying to access facebook or youtube.

I have installed a network in one VOIP (call center) with RB433. Network has 24 computers (22 Agents talking using SIP).

I want to make a log for each of them or one log maybe which would show each IP (I would add static IP to all of them by going DHCP Server > Leases. It's a good thing that I can see their names there by computer name and the way I imagined is to make a log for each user in Firewall filter list and see if they are working on facebook and youtube.

Basically I already have rules for blocking Facebook and Youtube but since director told me to unblock is cause he trust them, I want to make a log and see if he's right or not.

Now, I m guessing it would be like this:

Chain: Forward
Action: Log
Advanced Tab: Source Address - Address of certain Computer (Agent)
Destination Address - List of all Facebook/Youtube IP Addresses

Correct me if I m wrong ?
Thanks in advance,
Alex