People like to disparage Facebook, but it can be an incredibly useful tool. I'll give an example from my own life: Soon after I moved to Oakland, a neighbor recommended I join the neighborhood's Facebook group. It's become invaluable. Group members coordinate to help find missing pets, catch vandals, report stolen vehicles, and warn others about crime. City council members are also members of the group, so we work with them to fix problems. It's much more efficient and convenient than the standard ways of petitioning the local government.
This may seem like a trivial improvement, but it has caused the neighborhood to completely turn around. Everyone is amazed by how much better and safer the area has gotten. So I don't mind if Facebook's motives are ultimately profit-driven. People in developing countries could greatly benefit. It's win-win.