Stone has kept quite busy since leaving his day-to-day role at Twitter. In 2011, he relaunched the old parent company of Twitter, Obvious, alongside fellow Twitter co-founder Ev Williams and former Twitter product boss Josh Goldman.
Now, Stone is off to his next project: a mobile-first company called Jelly. Already, Stone has hired four or five employees to work on Jelly, Swisher's sources tell her.
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