This is seen as a big shift in WhatsApp's privacy policy. It is just going to share information with Facebook, which then will be used to show you "relevant" ads on your Facebook Timeline. With the change in privacy policy of WhatsApp, users may soon start seeing Facebook ads and friend suggestions based on their WhatsApp data. You will receive a WhatsApp notification, most likely in the coming days, informing you of the privacy policy update. In case you have already agreed to the new WhatsApp privacy policy and did not uncheck the Facebook option, you still have 30 days to go back and undo the changes.

Source: India Today August 26, 2016 08:15 UTC