hmm, don't they require you to use your personal facebook account to log into their facebook for work system as an employee? ( Am I just misremembering? )

That kind of flag can be useful to let test users and internal dev accounts get specific unreleased features or behaviors.

There are other ways to deal with specific users, but flagging accounts doesn't seem outlandish to me.

Facebook requires employees to provide their personal account, which will be used throughout the work.