Microsoft has confirmed that there’s an issue with its built-in Twitter feature that could result in unexpected data usage. The issue stems from a Twitter back-end change that has caused Windows Phones to re-download the profile images for Twitter contacts frequently. Twitter is currently transitioning its profile pictures from one server to another, and The Verge discovered the data use problem nearly a week ago and reported it to the software giant. On one of our own Windows Phone devices we found that the People hub, the section that hosts the built-in Twitter client, had used over 300MB of mobile data and over 3GB of Wi-Fi data in just under a week. The data drain occurs even if you don’t use the People hub. It’s not clear exactly when the issue started, but the level of data use will depend on how many Twitter contacts Windows Phone users have listed in the People hub.