Twitter on iOS is sending users random notifications.
The bug, which is occurring for the users of the iPhone and iPad Twitter app, does not affect Android users or people that have a third-party Twitter application.
People are receiving notifications that contain random number and letter combinations. CEO Jack later confirmed Twitter was having issues, saying "we're seeing this issue too" and "the company is onto it".
It's unclear why the issue has suddenly appeared on just the iOS application and not the Android app.
UPDATE 2: Issue fully fixed. Click here to read more.
UPDATE 1: CEO Jack Dorsey has confirmed the issue should be fixed. Some users are still reporting the issues, however.