Twitch, the startup which lets players broadcast and watch live streams of video gaming action, is not yet a huge public company. Yet it ranks among these web titans as one of the largest sources of broadband traffic during prime-time hours, according to a new study from the cloud and network infrastructure firm DeepField. We dont keep track of our share of global internet traffic, so that chart was news to us, says Matt DiPietro, Twitchs vice president of marketing.