On amazon.com, they have a thing which offers suggestions for you based on previous purchases. For example:
Buffy The Vampire Slayer - The Complete Sixth Season was released today; We thought you'd be interested because you bought Buffy the Vampire Slayer - The Complete First Season.
Seems logical, right?
Sometimes the connections are slightly less direct:
Walt Disney Treasures - The Chronological Donald, Volume 1 (1934 - 1941) was released today; We thought you'd be interested because you bought Muppets Magic: From The Ed Sullivan Show.
Those're both kid stuff of a historical sort, so that makes sense.
But how do these things even REMOTELY connect???
Bill Clinton's My Life was released today; We thought you'd be interested because you bought The Dog Lover's Companion to Boston: The Inside Scoop on Where to Take Your Dog.
I guess maybe the folks at Amazon figured that since I was looking for a place where my puppy could poop in public, I would enjoy reading a book wherein a former president publicly proclaimed that people pooped on him and in turn he pooped on some other people?
Pah. Poop on you, Amazon.
In Scotland there is an ancient proverb: "Don't shit upon your own doorstep." Therein may lie the elusive connection.