Sorry this article is in russian but I can't resist to share it here https://vc.ru/39051-keys-904-tysyachi-perehodov-v-sutki-na-testah-v-facebook You can read it via Google Translate. If in short, guys made tests site a la "who are you in Game of Thrones?" , posted in some big FB groups (relevant and not) and kickstarted a monstrous viral effect that lasted for 1 year. People reposted and shared their results and traffic was growing in geometric progression. They used Adsense, but i think they would've earned x10 more with CPA on this site.