WhatsApp CEO sold company to Facebook in 2014, is now exiting over rumored friction
(Newser) -
If you sold the company you co-founded for $19 billion in 2014, it makes sense that four years later you might decide to step down to focus on "collecting rare air-cooled Porsches, working on my cars, and playing ultimate frisbee," as Jan Koum wrote Monday on Facebook . But...