The document summarizes the past, present, and future of Pinterest. In the past, Pinterest's big idea was to allow users to organize and share things they find on the web using boards. It grew rapidly, becoming one of the top 10 largest social media sites within a year. Currently, Pinterest is most popular among 25-34 year old women and is used for planning, organizing, and curating interests like crafts, fashion, and food. Brands that are successful on Pinterest take a human approach by sharing ideas for how products can be used rather than directly selling. In the future, Pinterest may expand into e-commerce by allowing direct product sales or promotions to drive users to other sites.