What you post on Facebook, Instagram and TikTok can reach far more people than you meant, including strangers and scammers who use personal details to sound convincing. This guide sets who sees what. Do the two Essential items in each app you use. Meta is renaming Accounts Center to Meta Account, so you may see either name. The steps follow Meta's and TikTok's help pages for Android; on iPhone the Menu button may sit in a different corner.

Essential

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Privacy settings don't help if someone else can sign in to your account. Turn on two-step verification in each app and keep the recovery codes somewhere safe.

Facebook and Instagram

  1. Follow Turn on two-step verification: it covers both apps and explains which method to choose.
  2. Check where you are signed in: see Sign out of devices you don't recognise.

TikTok

  1. Tap Profile, then the menu ☰, then Settings and privacy → Security & permissions → 2-step verification.
  2. Choose at least two methods, an authenticator app among them if you can, and tap Turn on.
  3. In Security & permissions → Manage devices, delete any device you don't recognise, then change your password.
Essential

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On Facebook, the audience you set in the settings applies to every new post; reels and stories have their own audience setting. On Instagram and TikTok, a private account means you approve who follows you and sees your posts. Whoever can see a post can still take a screenshot and pass it on.

Facebook

  1. Tap Menu → Settings & privacy → Settings.
  2. Under Audience and visibility, tap Posts and set who can see your future posts to Friends.
  3. When you write a post, the audience button under your name changes it for that post only.

Instagram

  1. Go to your profile and tap Menu at the top right.
  2. Under Who can see your content, tap Account privacy, turn on Private account and tap Switch to private.
  3. Business accounts can't be made private.

TikTok

  1. Tap Profile, then ☰, then Settings and privacy → Privacy, and turn on Private account.
  2. When you post, tap Settings at the top of the preview screen to choose who can see that post.
Advanced

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Years of old public posts can be read by anyone and pieced together. You can narrow them in one go on Facebook; on Instagram and TikTok, you go post by post or in batches.

Facebook

  1. Tap Menu → Settings & privacy → Settings, then Posts under Audience and visibility.
  2. Tap View next to Limit who can see past posts, then Limit past posts, and confirm.
  3. Your old public posts become visible to Friends only. You can't undo this in one step. Posts with a custom audience and posts others tagged you in are not affected. Anyone you tagged in a post, and their friends, can still see it.

Instagram

  1. To hide one post, open it, tap Options at the top right and choose Archive. Only you can see archived posts, and you can restore them.
  2. To archive many at once, tap Menu → Your activity, then Posts under Content you shared, tap Select, choose the posts and tap Archive.

TikTok

  1. Open a post on your profile, tap More options at the side, then Privacy settings (you may need to swipe left).
  2. Choose Friends or Only you. TikTok's help page describes no way to change many posts at once.
Advanced

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Meta and TikTok choose ads from what you do in their apps, and also from what other companies tell them about you. You can reduce the second part; you can't turn ads off.

Facebook and Instagram

  1. In Facebook, tap Menu → Settings & privacy → Settings → Meta Account → Your information and permissions → Activity from other businesses. In Instagram, tap Menu → Meta Account and go on from Your information and permissions. Choose not to see ads based on this activity. It applies to both apps. Companies may still send Meta your activity, and ads can still come from customer lists that businesses upload.
  2. In Meta Account → Ad preferences, look through Customize ads and Manage info.

TikTok

  1. Tap Settings and privacy → Ads and turn off ads based on data from advertising partners.
  2. TikTok still shows you ads based on what you do on TikTok.