Twitter is advising all its 330 million users to change their password after a glitch left them exposed in the company's internal systems.
Twitter discovered the glitch and did not find any "breach or misuse by anyone," the company said in a blog post.
The bug left passwords in an internal log "unmasked", meaning that instead of showing up as an encrypted set of random letters and numbers, the password itself was displayed in plain text.
Even though the company says it has no reason to believe anyone obtained any sensitive information, it is telling users to change their password "out of an abundance of caution".
The company also said it is taking steps to ensure the bug does not happen again.