People who aren't logged into Facebook can still see things you've shared with the audience set to Public, as well as your public info (example: your name, profile picture and cover photo).

Your public search listing preview shows you what others see when they're logged out of Facebook and click the link to your Facebook profile from a search engine result, like Google or Bing. Keep in mind you can only preview your public search listing when you're logged into Facebook.

Learn how to control if search engines can link to your profile.