StumbleUpon is an online platform that enables users to discover new and interesting content based on their interests. In addition, users can easily share their own content by adding pages. There are 30+ million people using StumbleUpon platform, 13.6 million lists have been created and you can select from 512 interests. StumbleUpon can provide 3 times more traffic than Reddit. The information uncovers that the site represented 43% of U.s. movement against Facebook's 38%. This information is more verification of how valuable StumbleUpon is as an advertising device.