Pinterest is a virtual pinboard that allows users to collect and share photos and images linked to products. It has over 10 million monthly users and generates more traffic than other social media sites. Users pin images from websites to their boards, providing valuable backlinks. Pinterest is very viral, with over 80% of pins being re-pinned. The document recommends businesses use Pinterest to showcase their brand, promote products, help their business go viral, generate free traffic, and create buzz.