Eytan Oren

"What in the world is WhatsApp?" Reuters echoed the question many in the U.S. were asking when Facebook acquired the mobile messaging app in February for a stratospheric $19 billion. WhatsApp was more familiar to the rest of the world, where it had built a bulk of its estimated 450 million users—and where other competitors were gaining steam. Each began as "over-the-top" applications to avoid texting charges, but they've quickly blossomed into vibrant social media portals that are robbing users from Facebook and Twitter

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