Summarize the following:
It's the white "F" on a blue background. If you aren't logged in, enter your email address (or phone number) and password and tap Log In. It's in the bottom right corner of the screen (iPhone) or the top right corner of the screen (Android). It's at the bottom of the page. If you're using an Android, tap Account Settings. You'll see this option at the top of the pop-up menu. If you're on Android, skip this step. It's near the top of the page. This option is under the "Who can see my stuff?" heading at the top of the page. Doing this ensures that only you will be able to see the people in your friends and followers lists. It's in the top right corner of the screen. If there is no Save option, tap the Back button in the top left corner of the screen. It's in the middle of the page. Selecting this option will limit the number of people who can friend you to the people who are friends of your current friends. It reads "Do you want search engines outside of Facebook to link to your profile?". It's at the bottom of the page. Users on Facebook will no longer be able to look you up from outside of Facebook. Additionally, now that your Facebook privacy settings have been tightened, your name will display in other users' "Suggested Friends" list significantly less often, and other users won't be able to view your mutual friends or list of followers.

Summary:
Open the Facebook app. Tap . Scroll down and tap Settings. Tap Account Settings. Tap Privacy. Tap Who can see the people, Pages and lists you follow?. Tap Only Me. Tap Save. Tap Who can send you friend requests?. Tap Friends of Friends. Tap Save. Tap the option at the bottom of the page. Tap Allow search engines outside of Facebook to link to your profile. Tap Confirm.