Twitter

Market position

Twitter was described as one of the world's largest social media platforms and among the most-visited websites, though its user growth slowed relative to peers; daily tweet volume fell from a peak of about 661 million in August 2014 to roughly 300 million by January 2016. It was an S&P 500 component from 2018 to 2022 and was one of tech's most active acquirers, completing 86 acquisitions between 2008 and 2024 with roughly $1.2 billion in disclosed spending.

The defining constraint was brevity: posts limited to 140 characters, later 280, and after 2023 unlimited for subscribers. The service combined SMS-style immediacy with public, one-to-many broadcast, and Dorsey articulated guiding principles of simplicity, constraint and craftsmanship. Community Notes offered a crowd-verified context mechanism distinct from centralized moderation.

Technology

The service was built as an SMS-derived short-message broadcast system and was written in Scala, Java, Ruby, JavaScript and Python, with native clients for Web, Android, iOS, iPadOS and Amazon Fire Tablet. The company acquired technology to extend the platform, including Summize (search), Atebits/Tweetie (mobile app), Crashlytics (crash reporting), Magic Pony Technology (machine learning for media processing) and Gnip (data licensing). Recommendation algorithms were introduced into the main feed in 2016, and Community Notes (formerly Birdwatch) provided crowd-sourced context on posts.

Go-to-market

Growth was largely organic and event-driven, with the 2007 SXSW Interactive conference serving as a breakout moment. The company built out a global sales and office presence — more than 25 offices worldwide — including a Detroit office opened in 2012 to serve automotive advertisers and agencies, an expanded Dublin office, and an African headquarters announced in Ghana in April 2021.

Consumers and organizations worldwide posting and consuming short public messages, plus advertisers and brands (including automotive brands and advertising agencies targeted from its Detroit office), developers using its API and applications platform, and data customers licensing the firehose.

Geography

Headquartered in San Francisco, California, serving users worldwide, with more than 25 offices globally including Detroit and Dublin and an African headquarters announced in Ghana in 2021. Under Musk, the headquarters of X was moved to Bastrop, Texas, in 2024.

History

After the public launch in July 2006, Biz Stone, Evan Williams, Dorsey and other Odeo members formed Obvious Corporation in October 2006 and acquired Odeo and its assets, including Twitter.com, from investors; Williams then fired co-founder Noah Glass. Twitter spun off as an independent company in April 2007 with Dorsey as CEO. The 2007 South by Southwest Interactive conference was a turning point, with daily tweets rising from 20,000 to 60,000. Dorsey was replaced as CEO by Williams in October 2008 and became chairman; Dick Costolo succeeded Williams in 2011, and Dorsey returned as executive chairman, then as interim CEO in July 2015 and permanent CEO in October 2015. The company IPO'd on the NYSE in November 2013. Takeover interest surfaced in September 2016 from potential buyers including Alphabet, Microsoft, Salesforce, Verizon and Disney, but no deal materialized. Elon Musk disclosed a 9.1% stake in April 2022, offered $44 billion on April 14, attempted to terminate the deal in July, was sued by Twitter in Delaware's Court of Chancery, and closed the acquisition in late October 2022. Twitter merged with X Holdings and became part of X Corp. in April 2023; the platform was rebranded X in July 2023, X Corp. was acquired by xAI in March 2025 in an all-stock deal valuing X at $33 billion ($45 billion including $12 billion of debt), and xAI was in turn acquired by SpaceX in February 2026.

Risks & controversies

Following Musk's takeover, the platform was criticized for increased hate speech and disinformation, systemic prioritization of right-wing content, removal of misinformation reporting, the Twitter Files disclosures, suspension of journalists' accounts, and state-affiliated media labeling. It reportedly has the lowest rate of enforcement against violations of law among peers, and in February 2026 France raided X offices and fined the platform for failing to remove harmful and illegal content. X Corp. has sued nonprofits Media Matters and the Center for Countering Digital Hate. Earlier controversies included Dorsey's 2009 role in delaying site maintenance during Iranian protests, his 2018 Senate Intelligence Committee testimony on election interference, and reports that 2016 takeover suitors withdrew partly over abuse and harassment concerns. Roughly 15% of accounts (about 48 million) were estimated to be bots in 2020, and spam bot accounts were cited by Musk in his attempt to terminate the acquisition. The company posted operating and net losses in 2021 and underwent mass layoffs and resignations after the takeover.