A new feature dubbed “Whisper” will let those in a Twitch chat create a secondary conversation that appears in the same window they’re currently in. You can start a private conversation by typing “/w” and the username of someone you’d like to chat with.
The two people involved in the conversation don’t even need to be in the same chat room for Whisper’s private, in-line chat to happen.
You can choose to receive whispers from any Twitch users, or from broadcasters you follow. Both users need to be online, but Twitch says it’s working on offline delivery as well as pop-out instant messaging.
➤ Psst…Hey You…Let’s Whisper [Twitch]