We have already wrote about this specific issue. Sharing of your phone number with other data, will able Facebook to suggest more friends or to target advertising.
1. Open WhatsApp on your phone.
2. On Android, tap the action overflow button in the upper right corner and select Settings. On iOS, tap the Settings tab in the lower right corner.
3. Select Account.
4. Tap the check mark to the right of Share my account info.
5. To disable the feature, tap Don't Share.
If you are not sure whether you've done everything properly, you can check to see that Share My Account Info is grayed out.
Ta-dah. You're done. Now, WhatsApp wont share your phone number or other private data to your Facebook account.prije 11 mjeseca