X (formerly known as Twitter) is a 🏷️#social-platform that provides a microblogging service where users post and interact with messages known as "tweets." It was launched in March 2006 by 📝Jack Dorsey, Noah Glass, Biz Stone, and 📝Evan Williams, and quickly grew into one of the most influential platforms for real-time communication and news dissemination. Users can post, like, retweet, and reply to tweets, with content limited initially to 140 characters and later expanded to 280. In October 2022, the company was acquired by 📝Elon Musk, who subsequently initiated a rebranding to “X,” reflecting a broader ambition to develop the platform into an “everything app” integrating social media, payments, and commerce. The transition has included significant shifts in branding, product features, and moderation policies. In March 2025 X was merged into Musk's AI company 📝xAI, and it became part of 📝SpaceX when SpaceX acquired xAI in February 2026.
Under Musk, X has shed users and advertisers: it no longer publishes official usage figures, and independent estimates put its monthly users near 550–600 million in 2026, down from 2024. Linda Yaccarino, CEO since June 2023, resigned on July 9, 2025, and no successor was named. X now builds xAI's 📝Grok directly into the app, and in 2026 began rolling out X Money, a Visa-backed wallet for peer-to-peer payments, to U.S. Premium subscribers — the first concrete step toward Musk's "everything app."
Contexts
- 🏷️#spacex (See: 📝SpaceX)
- 🏷️#twitter (this is the 📝Root Memo)
- 🏷️#timeline-platform (See: 📝Timeline Platform)
- 🏷️#shifting-to-community
