Almost 2 years ago, a small website with only 12 million users managed to surpass Facebook, the social media king that had 600 million users at the time, as the number one traffic generating social media network. In the meantime, Facebook got a billion users and with this incredible rise it also regained its place as the number 1 traffic generator. Yet StumbleUpon is keeping strong at number 2, even though it only has a little over 25 million users (StatCounter). So how does this happen? And how can you use it to your advantage?