Free Proxy, Anonymous Proxy

[buntha]

Dear all  :D :D

I am have problem with anonymous proxy free proxy that i can't block it in pfsense, first time i block facebook by ip address is working well but when the client use free proxy or anonymous proxy on Firefox and Chrome Hola Better internet they can open facebook avoid IP blocking Rule in pfsense. So how can i do
Please help :( :( :( :( :( 
Thank

[Supermule]

Thats because Layer7 is not working as intended in PfSense…

[buntha]

Thank for answer
Can you tell me how to block free proxy or anonymous proxy?