FILE PHOTO: Jack Dorsey, CEO and co-founder of Twitter and founder and CEO of Square, speaks at the Consensus 2018 blockchain technology conference in New York City, New York, U.S., May 16, 2018. REUTERS/Mike Segar/File Photo

SAN FRANCISCO: Twitter co-founder and chief executive Jack Dorsey said on Tuesday (Apr 7) he was committing US$1 billion of his personal fortune to coronavirus relief through his philanthropic fund.