Twitch boasts an average of 1.7 million streamers every month, with an average of 550,000 concurrent viewers. Plus, Twitch argues, its audience watches videos for longer stretches of time than they do no YouTube: 421.6 minutes per viewer for Twitch versus 291 minutes per viewer for YouTube, based on comScore data. Twitch topped out at more than 2 million concurrent views on August 23rd, thanks to two eSports events, the League of Legends NA LCS Finals and ESL One: Cologne 2015.

Last year's top games on Twitch were League of Legends and Counter-Strike: Global Offensive, while Destiny and FIFA 15 were newcomers to the top 10. Mobile views now make up 35 percent of Twitch's audience.

For perspective, rival (and dominant) online video outlet YouTube boasts more than 1 billion users who watch hundreds of millions of hours on the site every day. But, these services have different markets -- Twitch focuses on live content, while YouTube is all about those jump cuts. Both services are clearly learning from each other as they, and their audiences, evolve.