Developers who accessed the Account Activity API between May 2017 and September 10, 2018 may have been affected by the bug described in this post.
Any developer who received data they should not have received is obligated per our Developer Agreement and Policy to delete that data immediately. In addition, to the extent you are in possession of such data, we request that you contact us immediately at AAAPI-Sept-2018-Bug@twitter.com.
If you have a question that is not addressed in the blog post, please look through the Account Activity API - Data Bug category. If your question is not addressed in there, feel free to submit a new topic.
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.
-Twitter Dev Team