“Let’s suppose an algorithm is showing you an opportunity to buy socks or stocks about five seconds after you see a cat video that makes you happy. An adaptive algorithm will occasionally perform an automatic test to find out what happens if the interval is changed to, say, four and a half seconds. Did that make you more likely to buy? If so, that timing adjustment might be applied not only to your future feed, but to the feeds of thousands of other people who seem correlated with you because of anything from color preferences to driving patterns.”