Steam is the premiere online gaming resource for most pc gamers. Steam sells games and has being doing so for decades and they are known for their “Steam sales” discounting products significantly. Now, with their latest client update, they are adding Steam Broadcasting which allows users who have “friended” each other, to watch each other play live through streaming technology and interact via chat which is becoming more and more popular with the younger generation of gamers. Many Youtube channels carry video of gamers recording themselves in split screen modes for entertainment and the trend is becoming more prevalent as the humour and entertainment value is comparable to watching television.
The link below gives you more information about Steam Broadcasting.