Facebook is a tool that can be used for a multitude of purposes. There's been talk about the link between Facebook and learning success. I don't think the outcome is related to the tool but rather to the person using the tool. Someone like me turns Facebook into a personal learning network machine. New parents may turn it into a place to celebrate their new baby. Social teens may use it for socializing. The point being that Facebook doesn't turn people into "things" but rather it is a tool to suit the needs of the user.
The following infographic does a nice job of explaining this as it relates to education.
Infographic by College Scholarships.org