He was a historian sharing a document he discovered with other historians.

Are scientists and researchers not allowed to use Facebook to share information?

Is Facebook allergic to data or facts?

Might I suggest using a personal/professional website that you control. You could even pay someone to set this up for you. But nobody uses those any more. Could it be that that’s the real issue: voluntarily handing over control of your contacts, data and reputation to an entity like Facebook – at no cost to the user – by default and then complaining about not being in control?

It doesn't seem likely that a person can have social interaction with others if everyone sets up their own website.

...at least not until some distributed social network becomes standard.