One of the most useful business school classes I took was entitled "Consumer Behavior" which was a deep dive into behavioral psychology and all the techniques used by marketers / websites to grab our attention. Booking.com rather overtly hits on all the techniques we discussed in detail.

I used to think these techniques were "dirty." But humanity evolved to be responsive to this type of manipulation. It seems the web has accelerated this process with the ability to A/B test on a massive scale. All the big websites exploit cognitive biases to drive engagement - facebook, google, twitter, instagram, netflix, youtube.

This is one of the reasons I'm convinced knowledge of behavioral economics is one of the most critical pieces of knowledge to have in the early 21st century - not only can you use it to drive engagement on your own platforms, but you can learn what tell-tales you are biased to react to, and resist accordingly.