Hints and tips:
...Last month, Jay-Z announced a partnership with former Twitter chief executive Jack Dorsey to launch a “Bitcoin Academy” literacy programme in the Brooklyn public housing complex where he grew up....
...It’s Jack Dorsey from Twitter. I have bad news. The president-elect’s Twitter feed has been hacked. KC: What’s happened?...
...Foursquare, which has about 160,000 users, has raised $1.35m (€932m, £828m) from investors such as Union Square Ventures and Jack Dorsey, who invented Twitter....
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