After a recent bug was discovered on Twitter the company is advising you to change your password. The problem has been fixed since then and Twitter yet to believes anyone has accessed your information but they still recommend you change your password.
We recently found a bug that stored passwords unmasked in an internal log. We fixed the bug and have no indication of a breach or misuse by anyone. As a precaution, consider changing your password on all services where you’ve used this password. https://t.co/RyEDvQOTaZ
— Twitter Support (@TwitterSupport) May 3, 2018