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Even if you never visit Facebook, you still provide it with information about you. Most of the links you visit from reddit or HN have an embedded Facebook Like button, which gives Facebook information about the sites you visit. FB uses that information to target ads to you. http://www.forbes.com/sites/kashmirhill/2014/06/13/facebook-...

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True. There are lots of tools to block that, however, on the desktop anyway:

1. AdBlock Edge (or Plus, but Edge doesn't have loopholes): https://addons.mozilla.org/en-US/firefox/addon/adblock-edge/

2. Disconnect: https://disconnect.me/disconnect

3. Ghostery: https://www.ghostery.com/en/

And I'm sure others….

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