Came across this content site (it does not sell products or do any affiliate marketing) called littlethings dot com which according to similarweb gets 30 million hits, mostly from Facebook. I saw one of the Facebook pages promoting its posts so obviously this site has been buying traffic (by making other pages post about itself). They have usual adsense and other ads from where they make money. I wonder what the economics behind this is. How do they buy traffic and make money from ads?