Too Long; Didn't Read
Recommender engines are like gifts from best friends who know you well enough to take into account your tastes insead of their own. Spotify uses collaborative filtering, Natural Language Processing algorithms to analyze lyrics, comments, to make predictions of what I may enjoy. Spotify analysts claim that 40% of the time, users are not sure what they want to listen to. The more shopping I do on one of the popular marketplaces, the better goods I see in my recommendation. The more I use them, the more accurate the recommendations become. It's almost impossible to make me buy things that I was not planning to buy.