As someone pointed out, any use of the internet and devices exposes one to hacking and theft. I would suspect that a vast source like Facebook would increase vulnerability exponentially. Why would someone harvest Forums when they can comb accounts by the hundreds of millions/billions at Facebook? Or Twitter, or Instagram, and etc. When you are online, you are more exposed than being in public because the numbers of people are greater. So due diligence paranoia is prudent. That said, we maintain a old-time landline phone, and half the calls we get are scams to some degree, misrepresenting who they are in writing on caller i.d., claiming to "work with" federal agencies like Medicare, assuming all kinds of good causes as identities, and just pure abuse in the number of "courtesy calls" from big corporation robots. Half the people who show up at the door are grifters of some description. So it is a culture-wide disfunction. Computer science just amplifies it.