X, formerly known as Twitter, is a social media and microblogging platform where users can share short messages, images, and videos. Founded in March 2006 by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams, it launched publicly in July 2006 and quickly became a major social media platform. X allows users to post and interact with content, including short text messages (tweets), images, videos, and live streams. The platform facilitates real-time information sharing, social commerce, and discussions on various topics. Posts were initially limited to 140 characters, then 280, but the limit was removed for subscribed accounts in 2023.
The company has undergone significant changes since Elon Musk acquired it in October 2022. In March 2025, X Corp. was acquired by xAI, Musk's artificial intelligence company. Linda Yaccarino, who took over as CEO in June 2023, resigned in July 2025. X has introduced premium subscription services that offer enhanced features, such as the removal of ads, access to the Grok AI chatbot, and advanced publishing tools. These premium tiers include Basic, Premium, and Premium+. Recently, X has faced controversies, including concerns about content moderation, the spread of disinformation, and accusations of enabling hate speech. In February 2026, X's office in Paris was raided as part of an investigation into the platform's algorithm practices and content moderation.