Lesson 1
What One Page Load Gives Away
See how one company’s code inside many sites lines up your visits, how the advert auction in a page load works, and what really explains the eerie advert.
Predict
On Saturday morning Sam reads a running-shoe review on a news site, looks at trainers in an online shop, then asks a question on a running forum. He never signs in anywhere, and the three sites belong to three unrelated companies. On Monday a trainer advert follows him onto a recipe site.
Who could have lined up all three of his visits?
Choose a prediction, then select Next to see the answer.