9to5 Google: Twitter to charge for SMS-based two-factor authentication – How to use Google Authenticator instead

9to5 Google: Twitter to charge for SMS-based two-factor authentication – How to use Google Authenticator instead. “Twitter’s latest move under Elon Musk is to start charging a fee for the use of SMS messages for two-factor authentication. To avoid that charge, here’s how to use Google Authenticator for Twitter two-factor authentication.”