Pinterest is a social media site that allows users to "pin" or share images, videos, and other objects to their pinboard. It grew rapidly, reaching 10 million monthly users in the US faster than any other standalone site. Pinterest is mostly used by women, who make up 70% of users. The site makes money through advertising, affiliate links, and selling goods and services. Marketers can benefit from Pinterest by gaining referral traffic and engagement from users repinning and commenting on their pins. New analytics tools are being developed to help users track referrals and success on the site.