Threads help to organize conversations and enable users to discuss topics without disorganizing a room. They improve the ability to process room content, find, follow, and resume conversations more efficiently, keeping threaded discussions focused. Threads are a series of replies or follow-up conversations under any message in a Team, Channels, Discussion, or Direct Message. They are identified by: 
.
Create a new thread
To create a thread,
Hover over the message you'd like to reply to.
Click the thread icon
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. A side panel opens.Type your reply. If you want to send your response back to the channel, select the Also send to channel box below your message.
Send the message once you’re done.
To close a thread, click the 
close icon on the thread header.
To create a thread in the mobile app,
Long-press the message for which you want to create the thread.
Select Reply in thread.
Type your reply. If you want to send your response back to the channel, select the Also send to channel box below your message.
Send the message once you’re done.
View threads in a room
To view the list of all threads in a room, click the thread icon in that room menu bar.
Expand and collapse a thread
Since threads appear by the side of any room in which they were created, you can expand them to occupy a lot of space.
To expand a thread, click the
expand icon on the thread header.To collapse a thread, click the
collapse icon on the thread header.
Follow a thread
You can follow and unfollow threads to get notifications on any messages sent under that thread. By default, you automatically follow any thread you belong to.
To follow or unfollow a thread, click on the 
bell icon on the thread header.