This is probably common knowledge: If I browse an item on say, backcountry.com, I'll find ads immediately for that same item on facebook. I leave reviews, somet

This is probably common knowledge: If I browse an item on say, backcountry.com, I'll find ads immediately for that same item on facebook. I leave reviews, sometimes negative ones for items I've already bought on backcountry, so it's kind of strange to then try to get sold the item, again. This is done by cross site cookies, though, right? Buying credit card shopping history (or something very similar) was highlighted in a Malcolm Gladwell book, but I forget which. If I search for, "Malcolm Gladwell" and, "Target" I just get SEO pages as search results, trying to sell me his books. Oh what a world!