My wife has a facebook account. Which is fine because she is intelligent, not easily swayed and has a strong spirit of discernment. Her facebook activities include keeping up with family & friends, but mostly she peruses these for sale forums. She also sells off a lot of stuff (mostly hers and children's clothing). The exchanges always take place in the lobby of my police department. A few buyers and a sellers have refused to do so, that's what we in LE call a clue. As long as she does not forget about OPSEC I am not concerned with her limited and appropriate social media footprint. Like many things in this world, it's all in how and how often you use it.