Facebook buys app from guy they rejected

SAN FRANCISCO, CA - FEBRUARY 19: The Facebook and WhatsApp app icons are displayed on an iPhone on February 19, 2014 in San Francisco City. Facebook Inc. announced that it will purchase smartphone-messaging app company WhatsApp Inc. for $19 billion in cash and stock. (Photo illustration by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - FEBRUARY 19: The Facebook and WhatsApp app icons are displayed on an iPhone on February 19, 2014 in San Francisco City. Facebook Inc. announced that it will purchase smartphone-messaging app company WhatsApp Inc. for $19 billion in cash and stock. (Photo illustration by Justin Sullivan/Getty Images)

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    Facebook buys app from guy they rejected

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In order to dominate messaging on phones and the Web, Facebook has acquired messaging service WhatsApp for $19 billion.