X Plans for AI on Collision Course With Latest US Privacy Laws

X Corp.—formerly known as Twitter—joined other tech companies in revising its privacy policy to allow it to leverage users’ data for artificial intelligence development, opening the door to potential legal headaches at the intersection of hot-button issues facing Big Tech.

X may combine public information with data collected from users to train machine learning and AI models, according to an update effective Sept. 29. The company also introduced new categories of information it plans to collect about some users, including biometrics and employment history.

The expanded data collection is part of owner Elon Musk’s aspiration to rebrand the platform ...