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Two Factor Auth (2FA) - List of websites and whether or not they support 2FA
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
Rapid 2FA - A painless way to add two-factor authentication to your site
YubiKey NEO - Hardware-based authentication
Authenticator App by 2Stable - An extra step of security never hurt anybody. Enable two-factor authentication on your online accounts and let Authenticator App by 2Stable do the rest.
Slack MFA - Shared two factor authentication in Slack