https://www.gamespot.com/articles/valve-launches-twitch-competitor-called-steamtv/1100-6461242/

Valve, which runs digital game distribution platform Steam, has launched Steam.tv, a video streaming portal that could be direct competition to Twitch and YouTube. Steam.tv is currently showing Dota 2's The International, with no option to watch any other games or stream to the service yet. However, it's likely that both of these features will be introduced in the near future.

Once logged in, Steam.tv displays the new Steam Chat introduced recently and allows users to invite friends to join and view the video feed together. Although the site is currently a bit unstable, CNET has managed to explore some of the other functionality available. It reports that Steam.tv has built-in voice chat on Google Chrome, but this doesn't seem to work on Firefox or Edge.