Facebook seems to be testing a new feature that will allow you to find the nearest wireless hotspots (Wi-Fi).
Some time ago, Facebook started asking its pages to provide Wi-Fi to their customers in their physical addresses.
It seems that information these could be used for the new social network project, although the results could be somewhat inaccurate, as no one can say for sure if the administrators of the pages did not lie about providing Wi-Fi.
The new feature first appeared on application of iOS, but not globally. It's currently unclear if Android users have the feature as well. Those asked didn't have it, but that doesn't mean there aren't a few lucky users of the Facebook app who do.
As for iOS, as mentioned above, it has not been released for everyone yet.
If you're one of the lucky ones, you can spot the feature on menu χάμπουργκερ που διαθέτει η εφαρμογή για cell phones.