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βFacebook's _fbp Cookie is odd - it's a cookie hard to describe as either 1st party or 3rd party - but it's used by Facebook's advertising system. When you see a Google Chrome search appending the _fbp cookie to https://t.co/OnzkoYd53J, it's more proof of G&F audience sharing.β
13 May 2019 ... Facebook's _fbp Cookie is odd - it's a cookie hard to describe as either 1st party or 3rd party - but it's used by Facebook's advertising system.