For people in areas without active CNM communities, or who aren't yet out enough to attend local events, online spaces are often where CNM education and community actually happen. The landscape of these spaces is worth understanding.
Reddit hosts the largest publicly accessible CNM communities. The main subreddits:
r/polyamory is the largest and most active. It functions as a general support and discussion space, with a lot of advice-seeking ("is this a red flag?", "how do I talk to my partner about X?"), personal experience sharing, and some theoretical discussion. The community skews toward progressive, non-hierarchical, communication-heavy polyamory. Advice can be thoughtful or reflexively categorical depending on the post and who responds first.
r/nonmonogamy is broader in scope, covering the full CNM spectrum including swinging, relationship anarchy, and open relationships that don't identify as polyamory. Less active than r/polyamory but more varied in perspective.
r/ethicalslutwho, r/polyamoryadvice, and various more specific subreddits (for solo poly, for poly parents, for hierarchical practitioners) exist with smaller but more focused communities.
Reddit's strengths: high volume, searchable, covers a wide range of questions, useful for reality-checking specific situations. Its limitations: advice quality varies significantly, anonymous communities can develop strong groupthink, and the most upvoted responses aren't always the most nuanced.
Discord servers
Discord has become a significant platform for CNM community, with servers ranging from large general polyamory spaces to focused groups (local regional servers, specific orientations, identity-based spaces like CNM for queer people or BIPOC people). Discord communities tend toward more real-time conversation and ongoing relationship among members, rather than the one-off question-and-answer format of Reddit.
Finding Discord servers: the Reddit CNM communities sometimes post invites; searching Discord server directories with terms like "polyamory" or "open relationship" surfaces options. Quality varies widely, and the invite-only nature of many servers means community recommendations are useful.
Facebook groups
Facebook hosts a large number of CNM groups, including both public discussion communities and more private, location-based groups used for local meetup organisation. Facebook's audience skews older than Reddit or Discord; groups there can be less jargon-heavy and more practically focused. Privacy considerations are real: Facebook's social graph means that participation in a CNM group can be visible to people in your network in ways that Reddit or Discord participation typically isn't.
What online communities are good for
Online CNM communities are genuinely useful for: getting initial exposure to how people think about non-monogamy and the language used; reality-checking specific situations with people who have experience; finding connection when local community is limited or inaccessible; and accessing perspectives from people with different relationship configurations than the ones in your immediate network.
They're less useful for: definitive answers about what you should do (your specific relationship context matters more than any general principle); replacing actual relationships and support; or as the final word on what's normal or correct in CNM (communities develop strong cultures and norms that don't represent the full diversity of how people actually practice).
Limitations to be aware of
Online CNM communities can develop strong ideological positions that are presented as universal when they're actually community-specific preferences. The dominant culture in a large subreddit may strongly favour non-hierarchical polyamory and look unfavourably on hierarchical arrangements, or may treat certain agreements as red flags that many people in CNM maintain without problems. Knowing that you're engaging with a community perspective rather than an objective standard helps you assess the advice you receive.
Advice from strangers on the internet is also necessarily limited by the information they have. A post asking "should I be concerned about X?" gets answers from people who don't know you, your partner, your history, or the full context of the situation. Community advice is a useful input, not a substitute for your own judgment about your specific situation.
Finding in-person community
Many local CNM communities use online platforms, particularly Meetup and Facebook Groups, to organise in-person events. Searching for "polyamory [city]" or "open relationships [city]" on these platforms often surfaces local groups. The jump from online to in-person community is significant and tends to be more valuable: knowing people locally who understand CNM provides a kind of support that online community, despite its scale, generally doesn't.