Trustpilot is a forum where customers can post reviews of their online shopping experiences. Users can share their information on site design, customer support, delivery, reliability, discount options, inventory and more. Trustpilot was founded in 2007 in Denmark and has since added 6 million reviews covering more than 100,000 merchants. It is active in 18 countries, primarily in Europe, and this investment will fuel US and global expansion. The round was led by Index Ventures, with participation from existing investors SEED Capital Denmark and Northzone.