Dorsey co-founded Twitter in 2006 and departed the company on Nov. 29, 2021, so that the company could move on from its founders. He remained the CEO of Block, a company dedicated to furthering economic empowerment through its portfolio companies. Since his departure from Twitter, the now-Elon Musk-owned company has experienced a rough patch, prompting some users to seek alternatives such as Urbit and Mastodon.
Source: https://www.coindesk.com/tech/2022/12/15/jack-dorsey-gives-decentralized-social-network-nostr-14-btc-in-funding/?utm_medium=referral&utm_source=rss&utm_campaign=headlines