Jack Dorsey

Jack Dorsey is best known as the co-founder of Twitter and Square, two companies that fundamentally altered how brands reach consumers and how commerce is conducted digitally. At Twitter, Dorsey oversaw the development of its advertising business, including the rollout of Promoted Tweets, Promoted Trends, and Twitter Ads — products that made the platform a significant player in social media advertising and real-time brand engagement. His vision of an open, real-time public conversation layer directly influenced how advertisers think about contextual targeting and audience engagement at scale. Dorsey co-founded Square in 2009, which evolved into Block, Inc., a financial technology ecosystem encompassing Square, Cash App, Tidal, and the Bitcoin-focused TBD division. While not a traditional AdTech company, Block's merchant tools and Cash App's consumer reach have created significant first-party data and commerce infrastructure that intersects with performance marketing and retail media trends. Dorsey stepped down as Twitter CEO in November 2021 and later departed the Twitter board following Elon Musk's acquisition of the platform. A vocal advocate for decentralization and open protocols, Dorsey has championed projects like Bluesky — a decentralized social media protocol — which has implications for how identity, data ownership, and advertising targeting may evolve in a post-platform internet. His influence on AdTech is largely structural: the ecosystems he built forced the industry to adapt to real-time, mobile-first, and commerce-integrated advertising paradigms.

Last updated Aug 25, 2026 by ATDb automated enrichment · Connections updated Aug 31, 2026