Slack Using Threads
Threads keep replies organized under the original message instead of flooding the main channel. Imagine a busy office bulletin board — without threads, everyone writes responses directly on the board and it becomes a wall of noise. Threads pin the responses neatly below each original post.
What a Thread Looks Like
MAIN CHANNEL (WITHOUT THREADS) MAIN CHANNEL (WITH THREADS)
────────────────────────────── ──────────────────────────────
Alice: "Review my design?" Alice: "Review my design?"
Bob: "I like the header!" ↳ 3 replies
Carol: "Font too small" [Click to view]
Dave: "Colors work well"
Alice: "Thanks all!"
Bob: "No problem"
Dave: "Anytime!"
→ 7 messages clog the channel → 1 message + collapsed thread
keeps the channel clean
How to Start a Thread
- Hover over any message in a channel.
- Click the speech bubble icon (Reply in thread) that appears in the hover toolbar.
- A thread panel opens on the right side of your screen.
- Type your reply and press Enter.
Your reply lands in the thread — not in the main channel. The original message shows a "X replies" counter so others know a conversation is happening.
The Thread Panel
SCREEN LAYOUT WHEN A THREAD IS OPEN ┌─────────────────┬─────────────────────────────────┐ │ LEFT SIDEBAR │ MAIN CHANNEL │ THREAD PANEL │ │ │ │ │ │ # general ← │ Alice: ... │ Alice: "Review │ │ # marketing │ ↳ 3 replies │ my design?" │ │ # dev-team │ │ ──────────────── │ │ │ Bob: "Other │ Bob: "I like the │ │ │ topic" │ header!" │ │ │ │ │ │ │ │ Carol: "Font too │ │ │ │ small" │ │ │ │ ──────────────── │ │ │ │ [Reply here...] │ └─────────────────┴──────────────┴──────────────────┘
Benefits of Using Threads
- Cleaner channel: Main channels stay focused on top-level messages only.
- Organized conversations: Each topic's discussion stays bundled with the original message.
- Less noise: People not involved in the thread do not get notified for every reply.
- Easy catch-up: Someone joining later reads the original message and its thread to get full context.
Threads vs Direct Messages for Side Conversations
USE A THREAD WHEN... USE A DM WHEN... ────────────────────────── ────────────────────────── Reply relates to a specific Conversation is personal channel message or sensitive Other channel members may Only 1-2 people need to want to follow along be involved Context from the original No connection to a message is needed channel message
Who Gets Notified in a Thread
By default, only the person who posted the original message and people who already replied in the thread receive notifications for new thread replies. This is intentional — threads prevent notification overload for everyone in the channel.
If you want to notify someone who has not replied yet, mention them with @username in your thread reply. They receive a direct notification.
Viewing All Your Threads
Click "Threads" in the left sidebar (or under the Activity section). This view shows all threads you started, replied to, or were mentioned in. It is the best place to catch up on ongoing discussions across multiple channels at once.
Key Takeaways
- Threads keep replies organized under the original message instead of cluttering the channel.
- Hover over a message and click the speech bubble icon to start a thread.
- Thread replies notify only the original poster and existing thread participants.
- Use @mentions inside threads to pull in people who have not yet joined the conversation.
- The Threads view in the sidebar shows all threads you are involved in across all channels.