http://news.xbox.com/2017/03/29/record-breaking-halo-world-championship-2017-comes-finish/
The Halo World Championship 2017 Finals by ESL broke digital viewership records across the board. At its height, the broadcast reached more than 135,000 concurrent viewers across Twitch, Twitter, Facebook, and Beam. In addition, more than 13 million unique viewers tuned in over the weekend to see competitive Halo played at the highest level across digital platforms. 10.3 million of these unique viewers watched the competition live on Twitter—a first time streaming destination for Halo esports.* These metrics exceeded last year's tournament and make the Halo World Championship 2017 Finals the most watched digital broadcast in Halo esports history.