Facebook "Likes" WhatsApp in a big way, so big, that they bought it for a whooping deal valuing $19 billion. The deal involves paying WhatsApp team a total of $4 billion in cash, $12 billion in stock and $3 billion in restricted stock vested over several years. It is to be noted that this deal is worth more than what Facebook raised in its own IPO, this is not all - the acquisition is not only the company's largest but also bigger than any that Google, Microsoft or Apple have ever done.
WhatsApp strictly stuck to the "No Ads" and "100% Private" no data sharing policy for long maintaining the 450 million monthly active userbase, with this acquisition the big question is "What about privacy and intrusive advertising which facebook is often associated with?". Well both facebook and WhatsApp has written about this as shared below.
Here's what WhatsApp and Facebook has to say about the future road-map, while it talks about "No Ads" there is no mention of user's data privacy: