The patent covers methods of forming circles and marketing to them, for example, by showing one person looking at a book detail page and who else in the circle has bought that book.
The second patent covers a method of discovering and delivering as search results related products from multiple categories, such as books written by Steve Martin, as well as DVDs of movies in which he appeared.
The third patent is the real kicker. It covers methods for encouraging consumers to write reviews of items they’ve purchased by determining the optimal times to send them e-mails or reminders.
. . . the patent even covers collecting reviews by letting visitors to a Web site fill out a form. [emphasis added]