WhatsApp messages and calls are end-to-end encrypted and cannot be  decoded by even the company itself. Though some claim that end-to-end encryption is not safe from the social point of view, violation of privacy of billions poses a counter logic. One can also opt out of advertisements by Facebook on the app by simply not sharing his/her phone number. So we can briefly conclude that our privacy is safely protected in WhatsApp.Read more at: http://www.pcadvisor.co.uk/feature/internet/how-secure-is-whatsapp-whatsapp-security-encryption-explained-3637780/