David Sacks CEO of Yammer leaves his position

David Sacks, co-founder and former CEO of Yammer, has left his position at Microsoft after having steered the enterprise social networking service for nearly six years. Sacks, a former PayPal exec who has been an angel investor in various startups and even once dabbled in producing and financing an independent feature film, launched Yammer at the TechCrunch50 conference in 2008. Sacks gave no reason for his departure.

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