Fixing a bug in our Account Activity API

We recently discovered a bug in our Account Activity API (AAAPI). This API allows registered developers to build tools to better support businesses and their communications with customers on X. If you interacted with an account or business on X that relied on a developer using the AAAPI to provide their services, the bug may have caused some of these interactions to be unintentionally sent to another registered developer. In some cases this may have included certain Direct Messages or protected posts, for example a Direct Message with an airline that had authorized an AAAPI developer. Similarly, if your business authorized a developer using the AAAPI to access your account, the bug may have impacted your activity data in error. 

It is important to note that based on our initial analysis, a complex series of technical circumstances had to occur at the same time for this bug to have resulted in account information definitively being shared with the wrong source. More here

Key updates:


  • The bug ran from May 2017 and within hours of discovering it on September 10, 2018, we shipped a fix to prevent data from being unintentionally sent to the incorrect developer.
  • The bug affected less than 1% of people on X.
  • Any party that may have received unintended information was a developer registered through our developer program, which we have significantly expanded in recent months to prevent abuse and misuse of data.

What’s next? 


  • If your account was affected by this bug, we will contact you directly through an in-app notice and on
  • We have contacted our developer partners and are working with them to ensure that they are complying with their obligations to delete information they should not have.
  • Our investigation is ongoing. We will continue to provide updates with any relevant information.

We’re very sorry this happened. We recognize and appreciate the trust you place in us, and are committed to earning that trust every day. For more on our updated API policies and how to monitor the apps you are using on X, see here and here