Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useful look at how geodemographic clustering works

Weiss gives an entertaining and well-written overview of how geodemographic profiling works. He explains the concept, compares the US profiling to other countries, and talks about its applications in marketing. Finally, he provides a breakdown of the 62 PRIZM clusters that existed at the time that the book was written. It may not be the book to learn about the US (but I don't think it's useless in that regard) but it's definitely the book to learn how marketers see the US.