The most useful Facebook “facts” in 2026 are not trivia about user counts or old acquisitions. They are the controls that decide who sees your posts, how people find you, what activity is stored and how information from outside Meta can affect your ad experience.
Start with what other people can see
Default post audience
Check whether new posts default to Public, Friends or another audience. A setting you chose years ago may still be shaping every post you publish today.
Profile and tagging
Review who can post on your profile, who can see posts you are tagged in and whether tagged content is reviewed before it appears on your profile.
Followers and public content
If you have public followers, review which profile details and interactions remain visible beyond your friend list.
How people find you
Phone number, email address and search-engine visibility can affect how easily strangers connect your account to information they already have.
Use the tools that show what Facebook remembers
Activity Log can help you review posts, reactions, searches and other account activity. Facebook also provides tools to access or download categories of account information. These are not glamorous settings, but they are the fastest way to understand the size of your own data trail.
Old likes, public comments and abandoned app connections can matter more than the post you made yesterday.
Review activity businesses send to Meta
Meta explains that activity from websites, apps and advertisers can contribute to ad delivery, depending on your settings. In Accounts Center and Ad Preferences, review controls related to activity information from ad partners and the explanations behind “Why am I seeing this ad?”
Remove connections you no longer use
Games, quizzes and services connected years ago can linger. Review apps and websites with account access and remove anything you no longer recognize or need.
Finish with login protection
Privacy controls are less useful if someone else can access the account. Review where you are logged in, update recovery details, use a strong unique password and enable the strongest sign-in protection available to your account.
Facebook privacy is a dashboard, not a switch
There is no single “make me private” button. The useful habit is to review audience, activity, ad data, connected apps and security as separate layers — especially after major app updates.