Amazon Product Co-purchasing Network MetaData is a dataset consisting of 548,552 product information data on Amazon's official website, including music CDs, DVDs, videotapes, etc. Each piece of information contains the name, sales ranking, related products, product category introduction and product reviews. This dataset was released by Stanford University in 2007. The data was collected in the summer of 2006. The related paper is "The Dynamics of Viral Marketing".