If there's another Twitch streamer you're trying to help get the word out for and they may not have a Facebook or Twitter account, you can use this to help them out by bringing eyes from those social media sites to Twitch and possibly cause more engagement.
If
Stream going live for a channel you follow
This Trigger fires every time a stream is going live for the specified Channel that you follow.
Then
Post a tweet
This Action will post a new tweet to your Twitter account. NOTE: Please adhere to Twitter’s Rules and Terms of Service.
And
Create a status message
This Action will create a new plain text status message on your Facebook Page.
Explore more great ways to automate Twitch and Twitter