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Two-factor authentication explained: How to choose the right level of security for every account
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What is two-factor authentication (2FA)?
Facebook two-factor auth
Two-factor authentication for Apple ID - Apple Support
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Two-factor authentication explained: How to choose the right level of security for every account
Migrating from U2F
How to set up the Two-Step Authorization (Google Authenticator). – Gaijin Support
Do you use SMS for two-factor authentication? Don't. - CNET