How do Facebook ads know what we searched on Goggle?

When you search things on Google or visit websites, what you’re looking at gets stored somewhere in your browser (Chrome, Internet Explorer, Firefox etc), in the form of what is called cache data.

When you sign into Facebook, you give them permission to just reach inside the jar of recent searches within your browser, and they look at what they can use for adverts, such as products you’ve viewed or even looking at flights for a holiday. They then show these adverts to you hoping you’re more likely to click on them because they know you’ve already searched for that stuff before, and clicking on ads often gives them money.

In short, searches are stored in a big jar of cookies and Facebook has permission to reach into this jar and feed you the ones it knows you like.

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