MY RECOMMENDER SYSTEM: AMAZON.COM

After my recent purchase of two items from Amazon.com and about several months of surfing and searching items on Amazon.com I realized my recommendation search has greatly improved. I searched many photography related items and realized lately from my computer and home and work without even logging into Amazon I'm getting photography related recommendation. I believe this has alot to do with my wish list and recent purchase. Better yet simply by typing 2.8 Amazon is smart enough to figure that I'm searching for fast lens. This goes back to the very fist lecture when we were asked for a definition of a word. How does a system know. Now Amazon has a better idea of me and my search query. I believe Amazon will continue to make good recommendations that are of interests to me.