The Facebook duo is no more. One of Facebook’s two cofounders is leaving the popular social-networking site.

Dustin Moskovitz is leaving and forming a new duo by taking engineer Justin Rosenstein with him. Together, the two will launch another company, Rosenstein said on his Facebook page.

Rosenstein, who was recruited from Google by Moskovitz in the early stages of launching the company, said the two have had similar visions on software and what Facebook needs to do to evolve as

“Leaving Facebook makes me sad, but I feel I have to follow my passion on that,” Rosenstein said. “I can’t say abundant about Facebook and the friends I’ve made here, and I am enormously excited for the company’s future success, a fate I’m confident it will reach regardless of my participation.”

Complementary Venture

The two will leave Facebook in about a month, Rosenstein said, and build an “extensible enterprise productivity […]

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