Twitch has more than half a million people watching live video at any one time

One of gaming’s biggest video sites is looking at its success during 2015.

Twitch revealed its 2015 retrospective today, and the game livestreaming company highlighted its enormous scale and growth as well as its passionate community. The company revealed that it has 550,000 people tuned in on average at any one time — and those people watched 241 billion minutes of content in total. The livestreaming site also pointed out that its audience is highly engaged even when you compare Twitch to YouTube, the other primary way that most gaming fans get online videos. On average, gamers spend 421.6 minutes per month on Twitch versus 291 minutes per month on YouTube. For Twitch, this is evidence that it has the attention of young people between the ages of 13 and 34, which makes it a crucial partner for marketers trying to reach that key demographic. That is pushing the size of the esports market — the primary driver responsible for the growth of livestreaming — to $194 million in 2015. And that sector is on pace to reach $465 million by 2017, according to Newzoo. But while Twitch is expanding thanks to competitive gaming, it is also seeing major contributions from its mobile efforts as well.