Jack Dorsey: What's next for Twitter's co-founder?
The last time the tech visionary left Twitter, he set up another company now worth $100bn.
By James ClaytonNorth America technology reporter
Jack Dorsey is one of Silicon Valley's eccentrics.
If he was a character in a movie, you'd think he was too cliche.
Acutely earnest and idealist… [+4643 chars]
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