article_snippet: Last month, WhatsApp, which was only founded in 2009, was bought by Facebook for $19 billion-
article_snippet: the most ever paid for a venture-capital-backed company. 
article_snippet: It was the social networking giant's biggest acquisition to date.
article_snippet: In a statement announcing the deal, Facebook founder Mark Zuckerberg described WhatsApp's services as 'incredibly valuable'.
article_snippet: WhatsApp makes money by charging users a subscription fee of $1 per year, although WhatsApp offers a free model as well.