Growing a community alone is slow. One of the friendliest ways to speed it up is to team up with others. Cross-promotion means two or more communities help each other reach new audiences, through shared events, recommendations or collaborations. Done well, everyone gains members who are already interested in related topics. Done badly, it feels spammy and damages trust. This guide explains how to cross-promote respectfully and effectively.
Why cross-promotion works
People who like one community often like related ones. A recommendation from a trusted place carries more weight than any advert. Members who arrive this way come with context and goodwill, so they tend to engage faster. Cross-promotion also builds relationships between leaders, which can lead to shared knowledge and support. It is a natural companion to the efforts in how to get your first 100 members.
Find communities that fit
Look for communities that share an audience but not a purpose. A baking community and a kitchen gadget community are better partners than two baking communities competing for the same people. Check size, tone and rules. A partner with a very different culture or poor moderation can reflect badly on you. Spend time as a member before reaching out, so you understand how they work.
Aim for fair exchange
Good partnerships are balanced. Do not approach with only a request. Think about what you can offer: a feature for their members, a guest post, a shared resource or a joint event. Communities of very different sizes can still partner if the value is fair, such as a larger one offering exposure while a smaller one provides niche expertise. Be honest about your numbers and goals.
Reach out personally
Send a short, friendly message to the leader or a moderator, not a mass template. Introduce yourself, explain why their community interests you and propose one specific idea. Keep it easy to say yes or no. For example: "We love your weekly photo thread. Would you be interested in a joint photo challenge next month?" Follow the courtesy you would want to receive, and accept a no gracefully.
Choose formats that feel natural
Several options work well:
- A joint event or challenge across both communities.
- A guest AMA with an expert from the partner community, as in how to run an AMA in your online community.
- A shared resource list or guide.
- Mutual shout-outs in newsletters.
- A co-hosted discussion thread.
Pick formats that give members something of real value rather than a plain advert.
Respect each other's rules
Every community has its own norms about promotion. Ask before posting anything, follow the partner's rules and make sure your members do too. Plan the activity together, agree on dates and wording and decide who handles moderation. Misunderstandings often come from assumptions, so write down the basics. Clear rules for promotion are also covered in how to handle self-promotion in your community.
Welcome the newcomers well
A partnership brings new faces, and first impressions decide whether they stay. Prepare a warm welcome, a short guide to your culture and an easy first action, using the habits in a community onboarding checklist you can copy today. Also prepare your regulars, so they greet visitors kindly instead of treating them as outsiders.
Protect your culture
Sudden growth can dilute what makes your community special. Keep expectations clear for visitors, watch for conflicts between groups and have moderators ready. If the partnership brings disruption, address it quickly and talk honestly with the partner. Your members' comfort comes before any growth number.
Measure and learn
Track what each activity brings: new members, repeat visits and replies. Ask newcomers how they found you. Review what worked with your partner and decide whether to repeat or change. Use numbers wisely, following the advice in community metrics that matter, and remember that quality of members matters more than quantity.
The bottom line
Cross-promotion grows communities through trust. Choose compatible partners, offer fair value, reach out personally and pick formats that benefit members. Respect each other's rules, welcome newcomers warmly and protect your culture. Measure results and nurture the relationship. Collaboration often brings better members than any advert could.
Frequently asked questions
How big should a partner community be?
Size matters less than fit. A smaller, well-matched community can bring more engaged members than a large, unrelated one.
What if a partner says no?
Accept it politely and keep the door open. You can try again later with a different idea.
Is cross-promotion spam?
Not when it is agreed, relevant and valuable to members. Unasked promotion in another community is spam.
How often should we collaborate?
Start with one event, review results and repeat if both sides benefit. Quality beats frequency.
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