⚡ Use case: Automate your Slack messaging to save time and stay personal

Whether you’re onboarding new members, running a community, or managing internal teams, sending the same message manually to multiple people in Slack is… a time-waster.

With PhantomBuster, you can automate this entire process in just two steps:

1. Extract users from a Slack channel,
2. Send a personalized message to each of them.

Let’s dive into the workflow.

🧰 What you’ll need

• A PhantomBuster account,
• Access to your Slack workspace (you must be logged in via browser),
• A Slack cookie (PhantomBuster will auto-detect it from your browser session),
• Two Phantoms:
  • Slack Channel User Extractor
  • Slack Message Sender

📌 Step 1: Extract Slack channel members

First, head to the Slack Channel User Extractor Phantom.

Here’s how to configure it:

1. Slack Cookie: If you’re logged into Slack on your browser, PhantomBuster auto-detects your cookie.
2. Workspace URL: Go to your Slack workspace > click the name in the top-left > copy the workspace URL (e.g., https://yourcompany.slack.com) and paste it into the Phantom.
3. Channel Input: Enter the name of the Slack channel you want to extract users from (e.g., #introductions).
4. Settings:
   • If you’re extracting from just one channel, no need to tweak advanced settings.
   • For large channels, you can limit the number of users per run (e.g., 20 for testing).
5. Advanced Settings (optional):
   • Scrape all channels,
   • Scrape custom fields,
   • Name your output file.

Click Save, then Launch the Phantom.

✅ Output: A list of Slack users from that channel — including names, job titles, and Slack IDs.

📩 Step 2: Send Slack messages automatically

Now head to the Slack Message Sender Phantom.

Configuration steps:

1. Workspace URL: Same as before — paste your Slack workspace URL.
2. Select Users to Message:
   • Choose the previous Slack User Extractor Phantom as your input source.
3. Write Your Message:

   • Customize the message. For example:

     Welcome to this Slack channel! If you have any questions or want to connect, feel free to ping me. 😊

   • You can personalize this with variables like {firstName} if needed.
4. Settings:
   • Set how many messages to send per launch,
   • Choose whether to send only to active users,
   • Name your export file (optional).

Click Save, then Launch your Phantom.

✅ Each selected Slack user will receive your message — no manual copy-paste needed.

And if you want to get a demo of this use case, here is the video we created.
 

✅ Why this is powerful

• Save Time: Reach dozens of people in seconds.
• Stay Personal: Tailor your message once, and reuse it at scale.
• Boost Engagement: Great for community managers, internal teams, or onboarding flows.

🔒 Important notes

• You must have access to the Slack channel (and Slack workspace).
• PhantomBuster uses your session cookie — so make sure you're logged in.
• Always respect Slack’s community guidelines and avoid spamming users.

🙌 Ready to try It?

This automation is great for:

• Sending welcome messages,
• Notifying users about updates or events,
• Automating onboarding in Slack communities.

If you try it out — let us know how it went! And feel free to ask any questions in the comments below 👇

Happy automating! 💬⚙️