mdy> The story of how that Sudafed ad got to me begins at Walgreens. As I bought tissues and Afrin, I keyed in my phone number so I could get loyalty See morepoints.
> When you enter your email address, phone number or other customer ID when checking out at a store, data brokers could get your purchase history.
> Information about the contents of my shopping bag began to spread. A third-party data collector—likely Nielsen-Catalina Solutions—added it to the purchase history it acquires from Walgreens.
>Johnson & Johnson, maker of Sudafed, paid the data broker for that information. With the use of Facebook’s tools, the information from my loyalty card—email, phone number, etc.—was matched with my Facebook account.
>Then via Facebook, Johnson & Johnson decided to target adults ages 25 to 54 who bought Sudafed or a competing brand. In other words, me.