The document summarizes the working mechanisms of Pinterest and LinkedIn. Pinterest was founded in 2010 in San Francisco and allows users to share and organize images and videos with others. It has over 500 employees and 70 million users worldwide, with 80% being women who use it mostly for food, crafts, home decor. LinkedIn was founded in 2002 in California and is a professional networking platform that allows its over 400 million users to make professional connections and document their careers. It has the most company followers in technology and business consulting firms.