Integrate Hotspot with Facebook WIFI.
“Facebook Wi-Fi lets customers check in to participating businesses on Facebook for free Wi-Fi access. When people check in to your Page, you can share offers and other announcements with them.”
Meraki,Cisco,Netgear,D-Link, Open-Mesh, Arua, Intelbras, Ruckus and Asus already have this in place.
https://www.facebook.com/help/126760650808045/