The giant IM app WhatsApp has announced that it is going to share user data, including phone number, with Facebook. By doing so, WhatsApp has taken a big step on money spigot. Facebook has also been looking for ways making money from WhatsApp.
Facebook is saying that it will help in improving Facebook ads and products experiences. However you still have options to opt out of the new policy terms. Next time when you update WhatsApp, press the "read more" option under policy and uncheck the box that reads "Share my WhatsApp account information with Facebook..."
Don’t worry if you have accepted the new terms without looking any further. You have still got 30 days to opt out of it. Go into settings menu and think click on Account tab. You can opt out of sharing your data with Facebook from there.