It is Facebook’s biggest acquisition to date.
WhatsApp has more than 450 million monthly users and is popular with people looking to avoid text messaging charges.
In a statement announcing the deal, Facebook founder Mark Zuckerberg described WhatsApp’s services as “incredibly valuable”.
WhatsApp allows users to send messages over internet connections, avoiding text messaging fees. The company claims it is currently registering one million new users a day.
It makes money by charging users a subscription fee of $1 per year, although it offers a free model as well.
The deal to buy it includes $4 billion in cash and approximately $12 billion-worth of Facebook shares, plus an additional $3 billion in stock to WhatsApp’s founders and employees at a later date.
On a conference call to discuss the deal, WhatsApp co-founder Jan Koum said he planned to operate the firm “independently and autonomously”. He will also become a member of Facebook’s board of directors.
“We’re excited and honored to partner with Mark and Facebook as we continue to bring our product to more people around the world,” Jan Koum said in a statement.
Mark Zuckerberg said the prospect of a deal was first floated just 11 days ago.
The Facebook founder said he believed WhatsApp was on track to have a billion users, but insisted he had no plans to place advertising on WhatsApp’s interface, saying he did not think ads were the best way to make money from messaging systems.
Once the deal is finalized, Jan Koum and co-founder Brian Acton are set to become Silicon Valley’s newest billionaires.
WhatsApp has about 50 employees in total.
Cathy Boyle, a senior analyst at research firm eMarketer, said WhatsApp was valuable to Facebook for several reasons beyond advertising, including its younger user base and its popularity overseas.
Shares in Facebook dropped 5% in after hours trading before recovering slightly.
Prior to this acquisition, Facebook’s biggest purchase had been Instagram for $1 billion in 2012.
Facebook had also reportedly offered $3 billion to acquire photo messaging service Snapchat.
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