What do I care if Facebook shows me ads for the things I browsed on Amazon or Etsy. I often discover fun stuff directly from those ads for websites I wasn't even familiar with. On the contrary (and I could be wrong to do so) but I trust some website when I have seen its ad on Facebook, as I know it has been vetted by Facebook to not be some fraud.
What do I care if Facebook shows me ads for the things I browsed on Amazon or Etsy. I often discover fun stuff directly from those ads for websites I wasn't even familiar with. On the contrary (and I could be wrong to do so) but I trust some website when I have seen its ad on Facebook, as I know it has been vetted by Facebook to not be some fraud.