No one likes to be wrong and no one likes to have it publicly pointed out.
I used to respond to family members directly with no CC's on stupid, blatantly incorrect info they would send out and gently inform them of what was incorrect and where they could check such things. It seemed to work for awhile, or so it seemed, until I found out that they just removed me from their mailing lists. I don't necessarily miss knowing about the next family reunion but it seemed extreme to need to make my younger brother promise to notify if Mom dies. I really would like to go to the funeral (and not to defend my position in the estate
Now I've decided that I will just delete/ignore info that I disagree with (assuming I'm ever added back to the mail lists). And I have no use for Facebook, Twitter or any sites that expose person information to the world, even when setup your security "correctly", and just waste time.
Paul (The Old fuddie-duddie and curmudgeon)