People with the Twitter app on their phones may have unlocked them to some strange letters and numbers displayed as notifications.
Earlier today, Twitter users set to receive notifications from the social network were treated to a series of notification bubbles containing garbled spam-like messages. This happened with enough frequency that even Twitter's CEO Jack Dorsey posted a message saying that the developers at Twitter were "on it."
A couple of hours later, the official Twitter Support account posted details about what the messages actually were. The "red bubbles" users see when they have unread notifications from Twitter on their devices were being sent as notification bubbles in code.
Outside of being abnormal and a statement that the issue has been resolved, there is no evidence of any hacking or personal data access.