Twitter believes that your account may have been compromised by a website or service not associated with Twitter. We've reset your password to prevent others from accessing your account. You'll need to create a new password for your Twitter account"
OK, panic over. I hadn't done anything wrong. I reset the passwords for the three accounts, making sure that I used lower and upper case letters, plus numbers and permitted symbols. Twitter told me that all three passwords were very strong.
And that should have been that. But it wasn't. The original notifications (and resetting) had happened on October 8th. On the 9th, one of the passwords was reset again. A second was reset again on the 11th. And the third was reset again on the 12th.
According to Twitter's help page, signs of an account having been hacked are:
- unexpected Tweets by your account
- unintended direct messages (DMs) sent from your account
- other account behaviors you didn't make or approve (like following, unfollowing, or blocking)
- Receiving a notification from us stating that "You recently changed the email address associated with your Twitter account." (even though you haven't changed your email address)
As yet, I've not had a reply. I'm hoping that's because they're investigating it and that I will receive an answer in due course. Have you had something like this happen to your Twitter account? And were you able to resolve it?