there was some glitch on twitter that was auto-locking some people for saying 'thanks' or something (and some other phrases). same thing probably happened to you
Yet I haven't even said anything.
I made this account, nothing tweeted, brand new account.
Nothing at all. And within 20 minutes, I was banned because "My account appears to have exhibited automated behavior that violates the twitter rules."
Even though I literally hadn't done anything.