The Portland (Maine) Press Herald has published an article that I suggest should be required reading for all Facebook users. It says, (in part):
“Facebook is a $245 billion business built on two comforting notions. One is that the people who see the family pictures, political rants and cat videos that you share on the social networking site are your friends. The other is that your communications over the ‘community’ of 1.5 billion people can be private.
“Both of these ideas turn out to be wrong – at least some of the time – and the nation is replete with stories of “private” messages between ‘friends’ that have gotten the sender divorced, fired or jailed.
“Now the notion of social media privacy has become an issue in the aftermath of the San Bernardino mass killing in which one of the shooters was a Pakistani national who may have made statements about her commitment to jihad and the terrorist Islamic State, also known as ISIS.”
You can read the full article at http://www.pressherald.com/2015/12/17/our-view-facebook-users-should-not-expect-privacy.