Dave Lee
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Facebook buys WhatsApp for $19bn

Facebook has bought messaging app WhatsApp in a deal worth $19bn (£11.4bn) in cash and shares.

In a statement announcing the deal, Facebook founder Mark Zuckerberg described the deal as "incredibly valuable".

But Facebook's share price dipped following the announcement.

The BBC's Dave Lee explains why some analysts think it may yet prove to be a good buy.

Go to next video: Facebook's WhatsApp deal explained