I just got some recommendations from an algorithm that were so good that it was creepy. (One of the recommendations was this video.)
It made me realize how such recommendations can be a nice shortcut for a machine into someones heart. (Although it only takes a few wrong recommendations to be kicked out again.)
I wonder if in the near future I'll have gotten used to the idea that an algorithm attached to my attention profile data will know me better than any human being could (and I'm not just talking about music).