Riot Games announced today that League of Legends has over 15 million registered players, with 3.6 million monthly active users and over 1.4 million playing daily. The company also revealed its peak concurrency (number of those LoLing at the same time) as over half a million players. This is the first time the company has publicly shared its user numbers since launching in October 2009.

The League of Legends Season One Championship drew in over 1.69 million online viewers, with 210,000 checking in for the final match. Riot Games plans to expand LoL in 2011 to Southeast Asia and China, home of its parent company, Tencent. Riot also made headlines recently with the human acquisition of Mass Effect 2 lead gameplay designer Christina Norman, who has taken a lead designer role.

Check out more coverage of today's announcement in our interview with Riot Games' CEO and co-founder, Brandon Beck.