Many have drawn comparison between the Facebook being in talks to buy Titan Aerospace and Google's Project Loon, which I think is fair comparison. I agree that if Facebook can provide cheap, free, internet to areas currently being underserved then that opens Facebook to new markets. Much like Google, Facebook makes money when more people use the internet.

 Sources:
Facebook Looking Into Buying Drone Maker Titan Aerospace by Sarah Perez (http://techcrunch.com/2014/03/03/facebook-in-talks-to-acquire-drone-maker-titan-aerospace/) Published on: 03.03.2014 and Accessed on: 03.05.2014