Why is twitter asking all its users to change their passwords? They discovered that login credentials were being stored unmasked in an internal log. This means anyone at the company who opened this log could see users’ passwords and usernames. A HUGE no no. The good news is, they have no evidence that suggests any passwords or account information have been stolen. Now this doesn’t mean that some Twitter systems analyst hasn’t taken down your credentials to use at a later date, it just means they don’t think it has happened.
While this is a huge embarrassment for Twitter, for most of its users it will likely be nothing more than a lesson on the importance of having two step verification enabled. Those lucky ones who reuse passwords will also be reminded why it is better not to as they scramble to remember all the accounts that use the newly exposed password.