In 2018 Twitter implemented support for hardware security keys. These are physical keys, small enough to fit on a keyring, to prevent certain types of accounts hacks. However, technical limitations meant that these accounts could only be accessed from a computer. Twitter has solved this issue by implementing WebAuthn protocol, this brings hardware security keys to more devices.

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This means that users with security keys for their Twitter account can now login from mobile devices as long as they’re using a compatible key. Security keys are recommended for high profile account holders, such as journalists and politicians. Twitter even rolled them out to their own staff after a cyberattack which abused an ‘admin’ tool.