On February 19, 2014, Facebook announced the purchase of WhatsApp for $4 billion in cash and 183,865,778 shares of Facebook stock ($12 Billion in current value) plus an additional $3 billion in shares to the founders that will vest over four years, for a total purchase price of $19 Billion. Malcovery Security’s Brendan Griffin says WhatsApp was being used as a malware lure since at least September 19, 2013. WhatsApp was one of our Top Five Imitated Brands for the delivery of malware via spam for the quarter.”]
Source: http://garwarner.blogspot.com/2014/02/whatsapp-spam-malware-distribution-scam.html