How to Build a Slack Community: Setup, Growth and Its Limits
Back in 2004, I used to communicate with my colleagues using Yahoo Messenger. Many of you may not even know about it - but back then, it was rage!
Then Slack came along and official communication switched from Yahoo Messenger to Slack. Whether you liked it or not - you had to be on Slack. Truth be told, I'm not a big fan of Slack. It's a tool that acts as distraction by inducing constant FOMO. But it gets the word done - and reduces the load on emails.
Slack as a Community Platform
Before you read further, I have a disclaimer. I built Jatra Community Platform, because I was tired of using Slack to run my communities. Slack is an excellent chat tool and it excellent for communication among the small, focused teams that have to get things done.
Communities are built different. The best run communities are relaxed, people aren't rushing to achieve anything. But that's the environment where best conversations happen. Community members feel free to express their views without the fear of being judged.
But I want to use Slack anyway.
No worries. I've built 'communities' on Slack. I'll tell you exactly what to do. I know that you are knew to community building; and want a guide that tells you exactly what to do.
Setting up Slack for your Community
I'm assuming you have Slack open on your computer browser or desktop. You're probably looking at empty room. Let's get the basics right.
The Channel Setup Rule
When you are starting, keep the channels count limited to 4-5. You should NOT break this rule. You may have 20 different topics where your future community can engage; but trust me on this. Not a channel more.
Start with these channels:
#welcome
#announcements
#introductions
#general
#help
No more topic specific channels at this stage. Let the welcome section be a warm welcome message from you, a set of 2-3 rules you expect the members to follow.
Other channels are self-explanatory. I won't go into details.
Seed your community
No one likes to join empty community. People may join; but they'd never return if you present them with an empty community.
Instead, create 5-10 posts about the topics that your users deeply care about. These questions should be in your niche, solve problem, entertain or educate. Find out what works for your community. This is important step; and you should not go to the next step before you seed your community.
I wrote a detailed guide on community seeding: How to Seed an Online Community (2026) | Jatra
Get your first 10 members
Now that your Slack is ready to receive members, I want you to control your enthusiasm. Hand-pick your first 10 members. Aim for the people you can talk on the phone or a call. These could be your most active customers or active beta users. The key is to keep this super restricted to only the people you can call or talk face to face.
Do not:
Send mass email to all users with community link
Post about your empty community on social channels
Post link to your community on your official website
Read: Guide: Get First 100 Community Members Quickly | Jatra Community
What to do when your first members join?
It's important to make the users feel at home after they join your community. It's your job to send them a personalized welcome message. Since you already know the members - you can make your message super personalized.
This works really well.
In your DM, motivate them to respond to the threads or just ask them to introduce in the #introductions channel. If they don't, no worries. It'll be slow in the beginning.
Keeping your community active
This is going to be an ongoing channel. As a community owner or manager, your role is to build the momentum and then step back. You shouldn't be the one answering all the questions or threads in the community.
Initially, observe the kind of content your users are engaging with. What are they posts they are engaging with? Make a note of everything.
Experiment with different topics and try tagging members in relevant threads. This is tricky. Don't overdo it. But a small nudge often brings members back. This thread might be relevant: Top 10 Fun Icebreaker Activities for New Communities That Always Work | Jatra Community
Growing your Slack Community
One of the hardest challenge I faced in all the communities I built was - user growth. The best ways that work are:
Expert AMAs
Weekly threads
Member spotlight
You can plan weekly rituals, and build topics relevant to your audience.
I've found that AMAs with experts are typically the largest crowd-pullers in Slack communities. If you do them well, you'll have relevant people join your Slack community.
Moderating Slack Community
As your community grows, you'll have to implement stricter moderation rules for your community. Make sure to keep it spam and troll free. This could be challenging; but I count it as 'nice problem to have'.
Maybe you should reconsider Slack as your platform
Slack was never meant to be a community platform. Having used multiple platforms to build large communities from scratch, I found Slack very limiting for communities:
Chats disappear quickly. A useful post I wrote today gets lost in 90 days.
Nothing is public. There's no way Google and AI chatbots can read and refer your content to people who need it (and are searching for it)
Paid plans charge per user: If you are building a paid community; you might consider paying $8/user/month to Slack. I've no comment.
There's no way to build a searchable knowledge base with user-generated content on Slack.
It's the exact reason I built Jatra. It allows you to build hybrid communities. You decide which content is available to Google and LLMs and what remains accessible only to authorized members. Here's how it works:
You start a community -> seed it with painkiller content -> Google and LLMs pick it -> Users find your community through search -> they see the value before joining -> users become members and participate -> user-generated content brings more people to the community.
So essentially - you build a growth flywheel.
Jatra bakes all advance technical SEO right into its core framework: Community SEO and AEO Features | Jatra
When to move on
I recommend using Slack to build the Minimum Viable Community. If you notice that you have 20 members who are participating actively - it's a sign that your community can take off. Once you reach that stage, it's time to book a call with me. I'll be happy to guide you through the entire process. I've done it several times.
If you have questions, post them below. I'll answer them as soon as I can.