More broadly, you can stop some of the web activity being used to target you with ads by visiting the YourAdChoices site run by the Digital Advertising Alliance. You'll notice Facebook advertising targeting is on the list of entries—tick the Opt Out box to do just that. Note that you'll need to do this separately for each browser you use; for the biggest impact, you should opt out of all the other platforms as well.
Locking down tracking in your browser is also recommended: Look out for the option to block third-party cookies in your browser settings (the sort that can track activity across multiple sites), and consider using well-respected tracker blocking browser extensions such as Ghostery or Privacy Badger.
On Mobile Devices
Courtesy of Facebook
Much of what we've already said applies to Facebook's mobile apps as well. If you want to limit what Facebook knows about you, you're best off not installing the mobile apps at all. Doing so gives Facebook permission to log the Wi-Fi networks you connect to, the type of phone you have, the other apps you have installed, and more besides, as well as everything you do on Facebook itself.
You can't stop all of this data collection, but you can curb it. Head to the Facebook permissions page—under Apps and notifications and Facebook in Android settings and under Facebook in i ..
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