Twitter co-founder and creative director Biz Stone is leaving the micro-blogging platform he helped transform into an internet phenomenon.
He will focus instead on relaunching Obvious, Twitter's original parent company, with fellow co-founder Evan Williams.
Stone announced his decision at the Aspen Ideas Festival and on his personal blog.
"I've decided that the most effective use of my time is to get out of the way until I'm called upon to be of some specific use," Stone wrote.
Twitter was spun off from Obvious in 2007, and that company was subsequently abandoned. Stone and Williams will partner with Jason Goldman, the former Twitter vice president of product, to try to breath life back into the defunct company.
It's not entirely clear what Obvious will do. Its website says "The Obvious Corporation makes systems that help people work together to improve the world. The proliferation of technology can seem superfluous, but with the right approach, technology can benefit individuals, organizations, and society."
Stone said he will remain involved unofficially with Twitter and will also concentrate on philanthropy.