I hope Mikrotik is looking at Facebook Wifi, currently supported by Meraki, Cisco and even Netgerr http://www.netgear.com/landing/facebookwifi/
https://www.facebook.com/business/facebook-wifi
Right now we have to hack the hell out of the walled-garden and completely open facebook (which kind of defeats the purpose as thats what majority of people want on the internet) just to get a facebook login.