Mark Zuckerberg, co-founder and chief executive officer of Facebook Inc., pauses during a keynote session at the Mobile World Congress in Barcelona, Spain, on Monday, March 2, 2015. The event, which generates several hundred million euros in revenue for the city of Barcelona each year, also means the world for a week turns its attention back to Europe for the latest in technology, despite a lagging ecosystem. Photographer: Simon Dawson/Bloomberg via Getty Images
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