I have a slew of acquaintances from around the world. Facebook makes it easy to stay in touch, and to discuss the things we enjoy. Yes, there are other ways to do this, via specific forums, which I also use. But facebook is a bit more casual, friendly, and easier to use. That said, it is frustrating to use it for serious discussions (of course that isn't what it is for)

But your last, fairly insulting question could be rephrased as "would an educated, independent thinker..., have any reason to communicate with anyone else?"

Facebook is just a communication tool.