Facebook always sends me mail messages about how happy they are that I have logged in, which I do more or less every 6 months or so.
They only excuse I accept from someone burying his/her head in their phone is if their partner is overseas and starts to whatsapp-ing. Because any other case you are offensive to others sharing the table and you might as well sit alone as you are not contributing to the conversation/activity.
As I have played many tabletop game sessions in my teens and twenties, I enjoy the interaction taking place at the table. I have seen what it does to otherwise shy people. Board games can be very entertaining as these also require social interaction. Even a local LAN party would have more social interaction in its thumb, than all of Facebook combined.
Facebook is an insult for intelligence, it is a shame the English language uses that same word for another concept and than Facebook is a godsend. Normally I'll honestly respond to all questions you/an employer/government official asks of me. This information exchange is quite restrictive in nature and exists after that in the memory of a friend or possibly in the database from employer/government. That is quite acceptable to me.
Facebook (or other "social" networks) makes this info available to anyone, 24 hours a day, 365 days a year. After all that info is all only one hack away from being on the streets, to be sold to the highest bidder. Furthermore, Facebook actively tries to connect all kinds of other info to your person with or without your permission, also to the highest bidder, while hiding behind EULA's and heavily buried privacy settings.
The above is my main gripe with social networks in general and Facebook in particular. If I would find myself in the situation to be employed in the US and I would meet such a moron manager, I would make sure not to have Facebook account but from the most obscure social network I could find.
That way he/she cannot complain about me not having a "social" presence on the web, only that we disagree on the choice of network. And hopefully drive home the point that the manager should have enough brain to ask me
information, instead of relying on data, coming from a 3rd party, that might have data I don't agree with associated with it for commercial reasons. Or because of "bit-rot
". Or because of untruthful information given by the person.
If they still insist on getting my credentials, I would demand for a recent security audit of their whole computer system. If they cannot prove to being able that they cannot store my credentials in a proper way that hackers cannot reach these, I might as well throw my credentials on the proverbial street and in that case I cannot guarantee anymore if my profile contains the correct information. Implying that employment at their company makes me liable for a situation out of my control is not a big plus for them.
Unreasonable from me? Yes, in a similar fashion as them demanding my credentials!
Still insisting? The world needs more HR drones...only these ones need to be launched by the Obama administration!