This is the statement from WhatsApp about the privacy concerns people might share:
We won’t post or share your WhatsApp number with others, including on Facebook, and we still won’t sell, share, or give your phone number to advertisers.
By coordinating more with Facebook, we’ll be able to do things like track basic metrics about how often people use our services and better fight spam on WhatsApp. And by connecting your phone number with Facebook’s systems, Facebook can offer better friend suggestions and show you more relevant ads if you have an account with them. For example, you might see an ad from a company you already work with, rather than one from someone you’ve never heard of.
You will need to first update your app.
- After updating your WhatsApp application launch it.
- Scroll to the bottom of the screen and you will be presented with a checkbox to grant WhatsApp permission to share your information with Facebook. Uncheck it.
- Launch WhatsApp
- Go to settings
- Head to account
- Uncheck the checkbox next to share my account info