I also only use FB to keep in touch with close friends and family. I do not display anything publicly, and have disabled the ability to search for my profile. I do not put any personal information and have blocked all 3rd party apps. I do not fill out questionnaires, participate in games or share ANYTHING that says how many LIKES and SHARES can I get on it. Am I 100% protected...no one ever is...but I have done all I could to not make myself a target.

There are a lot of privacy settings on FB you can use. I do not use What's App so I can't comment on that.