Go to Settings & Privacy > Settings > Your Facebook Information > Off-Facebook Activity to get started. You may then control your non-Facebook activity, wipe all history, and disable any future activity on your account. Note that if you delete your browsing history from within Facebook, it will also delete your history with other websites.
Your mobile device may not offer the same settings mechanism as its desktop counterpart does. Instead, search for "offline access" in the Google Play Store or "Settings" in the iOS App Store. This method will allow Facebook to continue to function while you're offline.
Here's how it works:
You can do so by navigating to Settings > Your Facebook Information > Manage Your Account. Off-Facebook Activity > Additional Options > Manage Future Activity > Manage Future Activity, and then deactivate the Future Off-Facebook Activity option.
The "Off-Facebook-Activity" feature is difficult to locate (though you can click that link to go directly to it). To get there, click the drop-down carrot in the upper right corner of the desktop version of Facebook. Then click "Settings" and then "Your Facebook Information." There is an option for "Off-Facebook Activity" there.
You must manually turn this off if you want to use products that track what pages you visit outside of Facebook. For example, if you use Google Analytics to track which websites you visit, then you need to turn off Off-Facebook Activity so that Facebook doesn't think you're still on the network when you visit other sites.
Turning off Off-Facebook Activity also turns off Related Pages. If you don't want to see related posts when you visit certain pages, then you'll have to turn off Related Pages as well.
Finally, make sure you clear your browsing history if you want Facebook to stop tracking you across other sites.
This option may be found in the right-hand column of the Manage Your Off-Facebook Activity page. It will deactivate your account on any sites and services that are currently tracking you. However, this does not "clean" anything. It simply breaks the connection between your account and Facebook's partners. If you want to remove all traces of Facebook from your device, you'll need to delete the app from your phone or tablet too.
However, Facebook now provides a mechanism for controlling the third-party information connected with your profile. To see these new Off-Facebook Activity choices on your phone, go to Settings > Off-Facebook Activities. Navigate to Settings and Privacy > Settings. Now when you delete items from your Timeline, they won't appear in related Off-Facebook Activity reports.
If you don't want to permanently remove your Facebook account (too many memories, I know), you may merely deactivate it. Navigate to the Settings & Privacy tab for your Facebook account (on the desktop, click the upside-down triangle on the top-right, then choose Settings). Here, you can change some of the options regarding what information you share with Facebook and other things. When you deactivate your account, the changes will go into effect immediately, but you can always reactivate your account at any time.
You have two alternatives on Facebook: deactivate or delete. The first could not be simpler. On the desktop, select Settings from the drop-down menu at the top-right of your screen. On the top left, click General, then Edit next to "Manage Account." Scroll down to the bottom to find a "Deactivate your account" link. Follow the instructions below to deactivate instead.
On Android or iOS, go to the Settings app and search for Facebook. Select your account and scroll down to find an option called "Delete Account." Press that button to confirm your decision.
After you delete your account, you cannot re-activate it again. So make sure you're happy with this decision before clicking through to delete it.
There's also a third option: block. This prevents Facebook from accessing your account but doesn't delete it. You can unblock yourself at any time. For example, if you forget your password, you'll need to block and then unblock it so that you can log back in.
The easiest way to block Facebook is to switch off access to your email from your phone's settings. Then, when someone tries to login using Facebook, you will receive a message explaining what has happened and giving you the opportunity to change it if you want to.
Blocking can only be done by users who are logged into their accounts.