Facebook is looking to use technology to bring internet service to every person in the world, providing service to those who right now have never had access.  I know what you're thinking, "Of course they are, then they can make even more money with more customers".  While there are monetary considerations to be sure, there is more to it.

As you'll see in this report from CNN.com, not everyone uses the internet for the same purpose.  Reaching people who have been without can provide them with useful technology.  I guess there's more to life than selfies and twerking.