This post fails to explain the value of Whatsapp to facebook at a very basic level. If everything about privacy in this post is correct, what exactly is facebook getting out of this deal? They paid 19B for Whatsapp, and are not going to collect any data on the users? How does that make any financial sense?
Appeals to emotion regarding the KGB are great, but you cannot convince me that a company the size of facebook would donate 19B to Whatsapp and expect nothing in return. Furthermore, having been acquired by facebook does not constitute a "partnership", since the decision making power of the founders has quite literally been sold off to the highest bidder.