So my dog growing up was a very rare dog breed, and today on instagram, I see a personalized ad with that breed.
I don’t use FB or Insta, so I think they got this by connecting me with my family, who then either posted pictures of our dog, or mentioned this breed’s name. FB then tagged me as being connected to that breed to target an ad for me. Creepy as hell.
CDN’s serve the images for many sites on the web. They used to be ad servers. They are collecting data on everything you do at a higher level than Instagram or Facebook.