[oddevan]

And to the last 5% that use the "Log in with Twitter" buttons in order to avoid creating another (probably weak) password, 2-factor is invaluable since it protects not just our twitter network but any accounts that it has been linked to.

[orbifold]

Sure if you don't care that Twitter knows all the services you use, then that is fine. It does make little sense to me to use Twitter as your main identity provider.