I’ll give you a hypothetical. Let’s say there’s a couple with kids who’re on FB and the husband is involved in some very delicate employment negotiations and the wife shares some confidential stories about her boss with while the kids are eagerly listening to those frightfully sensitive conversations. Then the little darlings, to show how cool they are, promptly disclose everything to the whole world over FB. BANG! Goes their livelihood.
Also, as a retired lawyer, the first thing I’d do to a client’s adversary would be go to that person’s social media, and his kid’s just to see what silver bullets might just be lying around
What you have posited is totally believable. I remember my parents, in the 1970s, telling my brother and me to just shut up about what we heard at home about ... various topics relating to the U.S. Navy, or other adult issues. Kids don’t understand why you shouldn’t repeat what you hear.
In real life, the possible audience was very limited, but on Facebook ... everyone.
I'm an investigative consultant for a number of insurance companies. Social media is one of the first stops any time claim fraud is suspected.