3 ms·Twitter doesn’t use 2FA over SMS. Dorsey’s hack doesn’t tell us anything about that.by mikeash 7y agoTwitter doesn’t use 2FA over SMS. Dorsey’s hack doesn’t tell us anything about that.mceachen 7y agoYes, they do. 2FA is via SMS or TOTP. Frustratingly, you can't enable TOTP without a phone number, and if you remove your phone number, you disable 2FA.mikeash 7y agoNo, they don’t. You can access your account with just SMS. That makes it 1FA.