If you use Twitter to log into non-Twitter software, sites, or systems, do this as soon as possible: Sign into that software, site, or systems and set up an alternate way to log in — whether via another service, such as Google, Facebook, or your Apple ID, or via good old-fashioned username and password.
As one techie at Twitter put it, “Entire teams representing critical infrastructure are voluntarily departing the company.” If accurate, it means that it would be a very bad idea to rely on Twitter as your only means of logging in.
Check your accounts!