HOW IT WORKS
It's no rocket science as it's built directly into the Facebook app itself, the Find Wi-Fi option shows a map of your location as well as listing all the companies, organizations or even individuals with free Wi-Fi hotspots or routers that you can connect to for free Internet access.
Moreover, if you are in a location where your mobile data is weak, you can use Find Wi-fi to look for available free wifi hotspot near you and connect.
HOW TO USE FACEBOOK FREE WIFI HOTSPOT
✔ Open your Facebook app
✔️ Click on the More tab and then Find Wi-Fi.
✔️ Once in the Find Wi-Fi tab, you may need to turn Wi-Fi on , if it isn't on already.
You can then browse the closest available hotspots on a map, and learn more about the businesses hosting them.
Note that it won't work on password protected WiFi around you. So those of you staying close to where there are free WiFi, this is yet another opportunity for free browsing.
Meanwhile, I think there is no big deal on this because even without Facebook, you can still connect to free WiFi. There are bunch of apps that can do that.