Your visibility and who can see your personal information on Facebook is completely up to you. Privacy settings control how visible your information and pictures are on the site as well as on search engines, and how they are shared.
Every social media site, including Facebook, allows you to choose your privacy settings. Decide how visible you want your contact and profile information, photos, videos and postings to be, and then take the time to learn how to set the right level of control.
For a guide to Facebook privacy settings, see Facebook family privacy: What are the 5 major settings to look at?