The fabulous life of Jack Dorsey, Twitter's billionaire interim CEO

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Jack Dorsey Twitter Square Portrait Illustration

Mike Nudelman/Business Insider

Twitter announced Thursday that current CEO Dick Costolo will be stepping down from his post, effective July 1. 

Jack Dorsey will be returning as interim CEO. This isn't Dorsey's first time in this post. He cofounded Twitter with Biz Stone and Evan Williams back in 2006, but left the company in 2008. He returned in 2010 to lead product, but ended up scaling back his responsibilities.

He will stay on as CEO of Square, the mobile payments company he founded in 2010, while managing new responsibilities at Twitter. 

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Dorsey first became a billionaire in 2012, and he is currently worth $2.4 billion. 

Rebecca Borison wrote an earlier version of this story. 

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