Twitter Inc. advised users to change their passwords after the company found a bug in its systems that exposed passwords in plain text internally.
The company said it removed the non-encrypted passwords from its system, and is working to avoid such an issue happening again. An internal investigation "shows no indication of breach or misuse by anyone" and there's "no reason to believe password information ever left Twitter's systems or was misused by anyone," the social-media firm said.
Still, the company advised users to change passwords for Twitter and other services with the same password.
Twitter shares fell 1 percent in extended trading following the news. The stock closed at $30.67 earlier in New York.