Right below League and Dota 2, of course
Twitch has come out with its top games for May 2014, as determined by overall number of minutes watched per title. The top two -- League of Legends and Dota 2 -- come as no surprise whatsoever. But Hearthstone: Heroes of Warcraft at number three? I guess it's here to stay.
As a casual viewer of Twitch, I wouldn't have necessarily expected Counter-Strike: Global Offensive to take the number-four spot, either -- though Valve has given the game and its players a lot of support, a lot of reasons to continue playing, in recent months. Makes sense.
As for the rest of the list, it's WoW, Minecraft, StarCraft II (poor old StarCraft II), Diablo III, Dark Souls II, DayZ, Call of Duty: Ghosts (heh), and the list goes on.