How does the Instagram algorithm actually work?
It’s a common question, especially these days!
Keeping up with what works and what doesn’t is a full-time job in itself. Never mind also staying on top of the latest feature releases!
In this post, I’m breaking down what you need to know about the Instagram algorithm in 2025 and how to get it to work for you.
Click here to jump to the 2025 insights
What is the Instagram algorithm?
The Instagram algorithm is a system with a set of rules that determine which content is shown and in what order.
While we refer to the algorithm as a singular thing, there are actually multiple algorithms at play.
Similar to the Google algorithm, Instagram have a variety of algorithms, classifiers and processes to determine what content is shown.
Each part of Instagram uses its own algorithm tailored to how people use it.
Let’s look at each part of Instagram…
1. How Instagram Feed ranking works
The main Instagram Feed displays content from accounts you follow, alongside recommended posts from accounts you don’t follow but might find interesting.
To determine what content appears on your Feed, Instagram uses a variety of signals, ranked by importance:
- Your activity: Posts you’ve liked, shared, saved, or commented on.
- Information about the post: Factors like how popular a post is (number of likes and how quickly people interact), when it was posted, and any attached location.
- Information about the person who posted: How interesting they might be to you, based on how often people interact with them.
- Your history of interaction: How often you engage with a specific person, such as consistently commenting on each other’s posts.
Using this data, Instagram makes “educated guesses” about how likely you are to engage with a post. The more likely you are to take action and the more heavily that action is weighed, the higher the post appears in your Feed.
2. How Instagram Reels ranking works
Reels are about entertainment and discovery. Most content comes from accounts you don’t follow. Here’s what affects ranking:
- Your activity: Reels you’ve recently liked, saved, reshared, or commented on help Instagram figure out your preferences.
- Interaction history: If you’ve engaged with the creator before, their reels are more likely to show up.
- Reel details: Factors like the audio track, visuals, and overall popularity of the reel help Instagram decide if it’s entertaining.
- Creator details: Popular creators with engaged audiences are more likely to have their reels shown, but Instagram aims to give everyone a chance.
Low-quality reels (watermarked, low resolution, muted or mostly text-based) and content against Instagram’s guidelines are ranked lower.
3. How Instagram Stories ranking works
The Instagram Story algorithm works a little differently, as here you will only see Stories from people you follow. Therefore, Stories are ranked based on how much Instagram thinks you’ll want to see them.
Here’s what they look at:
- Viewing history: How often you watch someone’s stories. If you always view their stories, Instagram will prioritise them.
- Engagement history: How much you interact with their stories (sending a like or DM).
- Closeness: Your overall relationship with the person (close friends or family).
Instagram predicts how likely you are to interact with a story to decide the order in your Stories tray.
Mosseri confirmed that the most important signals when ranking Stories are the likelihood that you’ll tap on, like or reply with a message.
4. How Instagram Explore ranking works
The Explore tab is made up entirely of content from new accounts and displays content that it thinks you’ll be most interested in, based on your previous interactions.
Here’s what influences the ranking:
- Your past activity: The posts you’ve liked, saved, shared, or commented on before influence what’s recommended to you.
- Post popularity: How many likes, shares, comments, and saves a post gets (and how quickly) matters a lot in Explore.
- Interaction history: If you’ve interacted with the person before (even if you don’t follow them), their content is more likely to appear.
- Details about the creator: Posts from accounts that get a lot of engagement from others are prioritised.
Why do we need an algorithm on Instagram?
When Instagram first launched it was a single stream of photos in chronological order.
As Instagram features expanded and more people joined, it was impossible to see everything that was posted.
To help with this, Instagram introduced a ranking system algorithm in 2016.
This algorithm’s goal is to keep us on the app for as long as possible. It does this by delivering content we find relevant and interesting.
How ranking on Instagram works in 2025
Mosseri released a series of videos to share how ranking works in 2025.
He explained that there are two types of ranking on Instagram. These are:
- Connected reach: these are the accounts that follow you
- Unconnected reach: these are accounts that don’t follow you
The most important ranking factors on Instagram
Mosseri shared the top 3 signals for ranking:
- Average watch time: average duration users spend watching a video
- Likes per reach: how many users like a post relative to the number of people who saw it
- Sends per reach: how often users share a post via DM relative to the number of people who saw it
Mosseri noted: “Likes are slightly more important for connected content and sends are slightly more important for unconnected content.”
If you’re looking to grow your account, these are the metrics you need to be optimising for. Use this information to tailor your content, based on the audience it’s intended for and the goal for that post.
How to be recommended on Instagram
In order to be eligible for recommendations, remember:
- No watermarks (especially from other apps)
- Add audio, even on photos or carousels
- Make sure videos are 3 minutes or less
- Post original content
- Good Account Status (check in profile settings)
Mosseri adds that using Trial Reels would be a good way to target unconnected accounts without bothering your connected accounts with too many uploads.
How to grow on Instagram in 2025
Instagram also recently shared that in 2025 they are focused on two main things: creativity and connection.
We know that Instagram are putting a big focus on social aspects of the platform, with Post Share Rates being the key driver of reach.
For creativity, we want to make sure our creative tools are best in class, embrace new technologies, and do more to reward original content. And to help people connect with friends over the things they discover on Instagram, we’re going to double down on messaging, make consuming content more interactive and social, and explore new ways to connect with friends.
So if you’re looking to grow on Instagram in 2025, focus on what people will find entertaining or might have an emotional response to. And, with Reels expanding to 3 minutes, you can really utilise storytelling elements to grab attention!