The Dark Forest Theory Explains Why Your Instagram Engagement Collapsed

Your engagement didn't collapse because your content got worse, because the algorithm changed, or because you posted at the wrong time. Those things matter, but they don't explain a broad, sustained decline in public interaction that almost every brand and creator has experienced over the past few years. There's a better explanation - it comes from a sci fi book, and if you've ever been in a hostile comment section, it'll ring true for you.

The Dark Forest, briefly

Liu Cixin's The Dark Forest is the second book in the Three-Body Problem trilogy - the same series Netflix adapted in 2024. The central theory of the book is an answer to the Fermi Paradox: given the age and size of the universe, why haven't we found evidence of other civilizations?

Liu's answer is bleak. The universe, he argues, is full of civilizations. They're just all hiding.

"The universe is a dark forest. Every civilization is an armed hunter stalking through the trees like a ghost, gently pushing aside branches that block the path and trying to tread without sound."

- Liu Cixin, The Dark Forest

Here's the logic: resources in the universe are finite. Any sufficiently advanced civilization will eventually need to expand, and because technological development is unpredictable, a civilization that seems harmless today could pose an existential threat within a generation, so the safest strategy is not to make contact, and not to respond when you hear signals from others. In the dark forest, silence is survival. Visibility is risk.

Liu was writing about alien civilizations, but the theory has been applied with increasing accuracy to the internet. And if you're running a social media presence for a service business, it explains a great deal about why your metrics look the way they do.

What happened to public engagement

In the early years of social media, public interaction felt safe. People commented freely, shared openly, and expressed opinions in spaces that were visible to everyone. The platforms were relatively new, the norms were still forming, and most users felt the benefits of being visible outweighed the risks because most of us were only connected to people we knew in real life.

That calculation has changed.

The public internet has become, in the words of a January 2026 analysis by Fleishman Hillard, 'a battleground,' a space where visibility invites scrutiny, where public statements can be taken out of context, shared to hostile audiences, and used against you. The comment sections of public posts have become vectors for harassment, bad faith argument, and the kind of performative disagreement that often boils down to virtue signaling.

Being visible in public spaces has started to feel, for a lot of people, like the hunters in Liu's forest: dangerous. So people did what people do when they feel threatened: they hid.

Industry researchers now describe the spaces where real social interaction happens as 'social dark forests' - private sanctuaries where users retreat from the performative, often toxic public internet for more authentic and trustworthy interactions. (Fleishman Hillard, 2026)

The migration happened gradually and then all at once. People didn't stop engaging with content. They stopped engaging publicly. They took the conversation somewhere nobody could see it, to discord servers and group chats.

The data reflects this clearly. Public likes on Instagram have been in sustained decline - Social Insider reported approximately a 24% year-over-year drop in engagement in 2025. But the engagement didn't disappear. It moved. Instagram's algorithm now weights DM shares three to five times higher than likes for distribution, according to April 2026 data from Social Insider - because DM shares are where real engagement is happening. Someone screenshots a post and sends it to four people in a group chat. That's meaningful engagement. It's just invisible.

Why public engagement became risky

The decline in public interaction isn't just about platform toxicity, though that's part of it. There are several converging forces pushing people into the dark forest.

AI slop. In 2025, AI-generated content surpassed human-written content online for the first time, according to Hootsuite's trends data. The result is that public spaces are increasingly populated by slop content - generated posts, automated comments, and bots pretending to be people. Real humans responding publicly become harder to distinguish from the noise, and many people have stopped bothering.

Performative stakes. Commenting publicly on social media is a visible act. It associates your name and your face with a position, a brand, or piece of content. For consumers who have watched public figures get dragged for unpopular opinions, and for professionals who manage their online reputation carefully, the calculus has shifted. Silence is cheaper than visibility. Saves and DMs are cheaper than comments.

Platform architecture. Instagram, in particular, has shifted its product toward private interaction. Stories disappear, DMs are contained, Close Friends limits visibility. The platform itself has built the architecture of the dark forest - and users have taken to it naturally, because it matches how they already wanted to behave.

It's also signaling a culture shift. As it's gotten easier to garner a large following, public trust in brands and influencers has declined. With platform building by sharing every moment of one's life becoming so easy, the status symbol is shifting to privacy and exclusive, invite-only communities. Now, that might sound like a "you can't sit with us" type of mentality, but it's the nature of trend cycles and the human desire for real connection. If what you want is an intimate dinner part, why would you throw a rager? If you want privacy and digital safety, why would you step out of your group chat (the dark forest) and into the the light (a comment section).

What this means for your content strategy

Here's the practical implication, and it's worth sitting with: if you're evaluating your content performance primarily through public metrics - likes, comments, follower count - those still matter, BUT the content that's doing even more work for you isn't necessarily the content generating the most visible engagement. It's the content getting saved and sent. I'm talking about the post someone screenshots at 11pm and drops into a group chat with 'has anyone seen this?' or the carousel someone sends to their business partner with 'this is exactly what we need.'

None of that shows up as a comment, but it's all engagement that matters more.

Public likes are declining. Instagram increasingly rewards watch time, saves, shares, and private interactions like DMs. The engagement is still there - it's just shifted elsewhere. (Social Insider via Sprout Social, 2026)

The metrics worth tracking in a dark forest environment are different from the ones signaled success five years ago:

Saves. Someone saved your post because they want to come back to it. That's a much stronger signal of value than a like, and it's one of the highest-weighted engagement signals for algorithmic distribution.

Profile visits. Someone was interested enough to come and look at who you are. They're evaluating you. That visit is a stage in a decision process, even if it leaves no visible trace.

DMs. The conversation moved to the dark forest. Someone who sends you a DM has taken a private, intentional action. That's a warmer lead signal than any number of public comments.

Watch time and completion rate on reels. Someone watched your video to the end. They didn't comment, or share publicly, but the algorithm saw it and it will use it to decide who to show your content to next.

How to create content for a dark forest audience

The shift to private engagement changes what good content looks like - not structurally, but in terms of what it prioritizes. Content that performs well in a dark forest is content worth sharing privately. The test is not 'will people comment on this' but 'will people send this to someone they know.' Those are different questions and they produce different content.

Content worth sending privately tends to be specific enough to feel personal, useful enough that the sender looks good for sharing it, or provocative enough that it sparks a real conversation. It's the post that makes someone think of a specific person immediately, a the framework that solves a problem someone's been trying to articulate, or a hot take that's edgy enough that someone wants to know what their trusted circle thinks of it.

Content worth sending is not content trying to please everyone. The more specific and targeted the message, the more it resonates with the right person - and the more likely they are to forward it to exactly one other right person, which is how dark forest sharing actually works.

A few practical shifts to keep in mind when you're designing your content:

Design for saves first. Ask yourself whether this post is worth returning to. Educational carousels, frameworks, checklists, and opinion pieces with real substance are more save-worthy than tips lists or aesthetic posts.

Write for the DM. Think about what would make someone screenshot this and send it with a note. That usually means something specific enough to feel like it was written for a particular situation - which is why industry-specific content consistently outperforms general marketing advice.

Invite private response. CTAs that direct to DMs rather than comments acknowledge the reality of where conversations are happening. 'DM me the word X' performs better than 'drop it in the comments' because it meets the audience's existing behaviour rather than asking them to change it.

Don't mistake quiet for failure. A post with three comments and forty saves is not underperforming. It's performing in the forest. The question is not how many people said something publicly - it's how many people did something privately that moved them closer to working with you.

There's a limit to the forest

The dark forest explains why public engagement has declined, but some accounts still get public comments. They're the ones that create content so specific and so human that the dark forest instinct is temporarily overridden. Someone reads a post that articulates exactly what they've been thinking and they can't not respond, or watches a reel that captures their exact situation and they have to tell someone - even if that someone is the stranger who made it.

Specificity is the antidote to silence. Generic content is easy to save and never return to. Content that feels like it was written for one specific person, in one specific situation, with a genuine point of view is content that pulls people out of the forest and into the comment section.

The dark forest is real, but it is navigable. The hunters in Liu's forest went quiet because they were afraid, and your audience is too, but if you give them content that's worth breaking cover for, and some of them will.

If you want to build a content strategy designed for how audiences actually behave in 2026 - not how they behaved five years ago - book a free strategy call at sonderandmedia.com/bookacall or DM us on Instagram.

Sonder & Media Creative Studio - Social media strategy and content management for growth-stage service businesses. Based in Surrey, BC.