Monitor users facebook usage

[nandi]

Hi guys,
I have a PfSense with Squid and LightSquid. The users are accessing the internet via proxy which is working fine. Ive got a task to monitor facebook usage/users. The Light Squid is reporting well but its a little bit not intuitive. Is there any other simple solution to do this ?, for example with ntopng I cannot do this because the reporting part is only available in professional version what it`s not supported by PfSense.
Thanks a lot