Instagram’s algorithm gets more opaque every year, which makes the moments when the company actually explains how it works unusually valuable. In January 2025, head of Instagram Adam Mosseri publicly confirmed the three ranking factors that matter most across all surfaces of the app. In April 2026, he updated those in a creator livestream. What he said was not complicated. What it means for how you should be making content is.
Here is what is actually confirmed, what changed recently, and what tends to work.
First, a Clarification About “The Algorithm”
Instagram stopped using the term “the algorithm” in 2025, and for good reason. There is no single algorithm. There are separate ranking systems for Feed, Reels, Stories, and Explore. Each one makes different predictions about what a given user is likely to engage with, weights signals differently, and serves a different purpose.
Feed is trying to show you content from people you already care about. Explore is trying to introduce you to things you did not know you wanted. Reels splits its job between entertaining existing followers and reaching new ones. Stories prioritizes the accounts you interact with most frequently.
Understanding which surface you are optimizing for changes which signals matter. That said, Mosseri’s January 2025 confirmation identified three factors that carry weight across all surfaces.
The 3 Confirmed Ranking Factors
Watch time
This is the single most important signal across Instagram. It measures how long someone spends with your content, whether that is watching a Reel, reading through a carousel, or pausing on a photo.
For Reels specifically, the first three seconds are the ones that decide whether a video lives or dies. Meta’s internal data shows users make a stay-or-scroll decision in approximately 1.7 seconds. The goal for the first three seconds is not to be clever or artistic. It is to give the viewer a concrete reason to keep watching.
Completion rate matters beyond those first seconds. Instagram uses it as a signal of genuine value. A Reel that people watch all the way through tells the algorithm something different than one that holds attention for five seconds and then gets scrolled past. If your Reels are consistently under 60 percent completion, the problem is usually either a weak hook or a video that loses its point in the middle.
Sends per reach
DM shares are worth three to five times more than likes when it comes to reaching new audiences outside your existing followers. Mosseri has explained why: Instagram’s purpose, as he described it in a conversation with podcasters Colin and Samir, is partly to connect people with their friends. Content that people send to someone they care about is doing exactly what Instagram wants the platform to do.
The practical question this raises is: does your content make someone think of a specific person? That is the mental trigger for a DM share. “This is exactly my friend Priya” or “my sister needs to see this” or “this is literally our apartment” are the moments that drive sends. Broad relatability is less valuable than specific, acute relatability.
Likes per reach
Likes still count, but they carry less weight than watch time or DM shares, especially for reaching audiences outside your followers. For existing followers, likes per reach is more predictive of continued distribution to that same audience. For discovery and recommendation to new people, sends dominate.
Something worth noting: Instagram officially down-weighted likes as a general ranking signal in an April 2026 update. A Buffer report from earlier this year attributed part of the 26 percent drop in average engagement rates (from 7.3 percent to 5.4 percent) to this down-weighting. Accounts that built their strategy around chasing like counts are seeing the effects.
What Changed in April 2026
Mosseri’s April 2026 livestream updated the picture. He confirmed four signals that Instagram now uses to rank Feed, Reels, and Explore content: interest, recency, relationship, and frequency.
Interest reflects what you have engaged with before. Instagram’s system builds a detailed picture of topic and format preferences and uses it to predict what you are likely to engage with next.
Recency means newer posts get more reach, all else being equal. This is not new, but Mosseri reconfirmed it. The algorithm does not have strong nostalgia for older content.
Relationship is based on DM activity and saves. The more you DM someone or save their posts, the higher Instagram ranks their content in your feed. For creators, this means that content encouraging saves and DMs is building the kind of relationship signal that leads to sustained reach with existing followers.
Frequency captures how often each individual user opens Instagram. Heavy users see more varied content. Light users, who open the app less often, see a tighter selection weighted toward accounts they interact with most.
The “Your Algorithm” Feature
One of the most significant changes Instagram made in late 2025, which went fully live globally in early 2026, is a feature called “Your Algorithm.” It gives every user a personal dashboard in Settings under Content Preferences, showing the topics Instagram believes they care about.
Users can add topics they want to see more of and actively remove categories they do not want. This is a direct user-side control over the recommendation system, not an account-side one.
For creators, this matters because it means the audience can now actively exclude content they are tired of seeing in a category. It is not enough to make Reels about fitness if the person watching has already removed “fitness” from their preferences because they are exhausted by that content. The recommendation system is now partially user-curated, not just algorithmically assigned.
The practical implication is that niches are more important than ever. Content that is clearly about one specific thing is easier for users to add to their preferences or remove. Content that covers four different topics is harder to categorize and may not align cleanly with any of the preferences a user is actively managing.
What Instagram Penalizes
Several things reliably reduce distribution on Instagram in 2026.
Reposting other people’s content is the clearest case. Instagram confirmed that original content receives 40 to 60 percent more distribution than reposts. Accounts that post ten or more reposts within 30 days get excluded from Explore and Reels recommendations entirely. If your content strategy involves reposting, those posts will reach your existing followers but will not grow your audience.
Watermarks from other platforms hurt reach. TikTok watermarks on Reels are the most common example. Instagram treats these as signals that the content was made for a different platform and distributes it accordingly.
Very short Reels (under 15 seconds) are no longer the sweet spot they were in 2022 and 2023. Instagram is now actively recommending Reels up to three minutes to non-followers. Longer content gives the algorithm more watch-time data to work with and more opportunity to confirm that a viewer is genuinely engaged.
What Actually Works in 2026
The tactics that are moving the needle right now, based on what Mosseri has confirmed and what creator data shows:
Strong hooks in the first 1.7 seconds. This does not mean a title card. It means something that is immediately visually interesting, surprising, or personally relevant to the target viewer. “5 things about X” is a weak hook. Showing the surprising outcome of something before explaining how you got there is a stronger one.
Captions that contain relevant keywords. Instagram Search now reads caption language the way a basic search engine reads page copy. If your content is about apartment decorating on a budget, that phrase should appear in your caption. Mosseri has listed captions as a Reels ranking factor for SEO-style discoverability.
Carousels with multiple slides. When a viewer does not swipe through your entire carousel, Instagram re-shows the post later with the unseen slides. More slides create more re-engagement opportunities from a single post. Buffer’s data shows carousels are currently achieving some of the highest engagement rates on the platform.
Replies to comments with video. This creates additional content and signals active engagement from the account. Instagram interprets it as a sign that the creator is genuinely connected to their audience.
Posting consistently rather than chasing individual virality. The algorithm now requires sustained weekly signals rather than rewarding individual posts. One Reel that goes somewhere does less for long-term growth than a steady cadence of content that reliably performs at a moderate level.
What the Numbers Actually Look Like
Average engagement rates on Instagram have dropped from 7.3 percent in 2024 to 5.4 percent in 2026. That decline reflects three things happening at once: likes being down-weighted as a signal, Reels supply roughly tripling while user attention stayed flat, and the algorithm now requiring consistent weekly performance rather than rewarding individual posts.
This means the accounts growing fastest in 2026 are not necessarily the ones making the best individual videos. They are the ones making consistently decent videos at a regular cadence, optimizing for sends and saves rather than likes, and keeping their content tightly focused on one or two clearly defined topics.
That is less glamorous than the viral video story. It is also more repeatable.
The algorithm Mosseri is describing is one designed to reward genuine connection, content that viewers find and share with specific people, over broad popularity metrics. For creators willing to make content for a defined audience rather than everyone, that is actually good news.
