Block FACEBOOK on specific IF

Hi to all
As i read in other posts, there is a way to block the Facebook for specific IP source (client).

What abou if we want to block only this site for let say the Wireless interface ?

Thank you in advance

If you have kids you cant sleep no more !!!

as i see it you can create a layer7 protocol in which you define facebook.com|fbcdn.net
and you can block the requests in filter, setting in via wireless interface, dst port udp 53 and layer 7 protocol the one you define earlier

Layer 7 protocol ?

Sorry but i am not so expert.
Can you please be more specific ?

Thanks

http://forum.mikrotik.com/t/firewall-filter-content/67332/1