Grok, an AI language model, has been integrated into the platform X, allowing users to fact-check tweets directly. It is now available as a standalone app in the U.S. App Store, enhancing user experience with features such as image generation and internet information retrieval. Users have praised the app for its interface and interaction capabilities, which are seen as improvements over the existing platform. Additionally, Grok's integration aims to simplify the process of finding old tweets, making it a valuable tool for users. The X team has been commended for their efforts in developing Grok and ensuring its seamless functionality.