D. T. Max: After Twitter and Square, What is Jack Dorsey’s Next Move? : The New Yorker

If you're eager to learn more about Twitter's history, this ~10,500-word article in The New Yorker and a recent ~6,200-word Twitter book excerpt in The New York Times are timely information resources

"Jack Dorsey, of Twitter, is now making big money at Square—and is out to prove that he’s more than a lucky man."

D. T. Max: After Twitter and Square, What is Jack Dorsey’s Next Move? : The New Yorker