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I've noticed a number of yung'uns ditching FB completely for Instagram. Delegating auth to FB alone is an insanely self-defeating move.

FB owns Instagram.

Accounts are not linked though.

Yeah, sure.

Snark aside, they're not. Really. They might be internally associated, but they're definitely not linked.

I'm banned (mysteriously) from Facebook, but not from Instagram.

You can't use your instagram credentials to log in on sites that have Facebook logins..

It didn't defeat Tinder or any number of other major apps.