Twitter's SMS two-factor authentication is now a paid feature
Non-subscribers will still have access to 2FA via authentication apps and security keys
Twitter blue articles
Twitter relaunches $8 p/m Twitter Blue service, costs $11 p/m on iOS
The Apple tax is likely to blame
Elon Musk could bring back Vine, will make users pay for Twitter verification
Employees have until next week to launch the $20 pm service or they'll be fired