What is Facebook Wi Fi and how does it help pages grow
Facebook WiFi is basically free Internet partnered with Facebook, so whenever a person visits your shop he/she can access the Internet & browse social media, also with-in the Facebook app a person can open "Find WiFi" he'll/she'll be shown all the places which have/support this facility.
Most people can configure their routers to give an access point by following instructions on their Facebook page, also only some or newer models of routers support this.
Set Up Facebook Wi-Fi for Your Business
If you have a business with a physical location, such as a store or restaurant, you can set up Facebook Wi-Fi to get more customers. Facebook Wi-Fi allows customers to connect to your business's guest Wi-Fi after they check-in to your business on Facebook. The check-in shows up on the customers’ newsfeed, which is visible to their friends and on your Facebook Page.