An ad pops up that’s right up your alley, or three new articles show up in your feed that are similar to something you’ve just clicked on.
Sometimes it seems like Facebook knows you personally, and that’s because it does. It has algorithms that track what you like, watch and click on. Facebook uses this information to target ads or relevant posts to users on behalf of advertisers.
If you're a Facebook user, you expect the company to be tracking you, at least a little bit - it's just the nature of the beast. But what about non-Facebookers?
As you can guess, not everyone is thrilled with the announcement and its seen a lot of backlash in the U.K., especially after the Belgian Privacy Commission ordered Facebook to let its users opt-out of ad tracking last year.