> You're being playful about this, but I'm legitimately worried about a future where job candidates are rejected purely because they didn't offer their social media identities or passwords.

Demanding a social media identity or password is a great idea if you want to paint a huge target on your back for a discrimination lawsuit.

Said social media account will contain a lot of information about whether or not you are a member of a protected class. Good luck proving that you didn't use it in your hiring decision.