Jack Dorsey, Twitter’s chief executive, has pledged to donate $1bn (£800m) to fund coronavirus research to help “disarm this pandemic”.

Dorsey, who co-founded Twitter in 2006 and went on to found payments company Square, tweeted on Tuesday that he was donating $1bn of Square shares to a charitable fund, called Start Small, to “fund global Covid-19 relief”.

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In two follow up tweets, Jack said 'Why pull just from Square and not Twitter? Simply: I own a lot more Square. And I’ll need to pace the sales over some time. The impact this money will have should benefit both companies over the long-term because it’s helping the people we want to serve'.

Ending with 'Why now? The needs are increasingly urgent, and I want to see the impact in my lifetime. I hope this inspires others to do something similar. Life is too short, so let’s do everything we can today to help people now'.