How does the Facebook Reels algorithm work?

Answer: Facebook Reels’ algorithm works by evaluating a multitude of signals to determine the content most likely to capture the user’s interest.

These signals, which include actions like likes, shares, comments, follows, and time spent on a video, help shape the content that appears in a user’s Reels feed and its sequence.

The Reels feed is pivotal in how content is consumed on Facebook, presenting users with a mix of videos that get more personalized as they engage with the platform. This feed blends familiar content from creators you already follow with new content that aligns with your tastes, ensuring the experience stays both engaging and fresh.

Myth busting: There’s a common belief that Facebook’s algorithm might have some intricate secret to its recommendation system, but experts suggest that it’s not about hidden magic. What really sets Facebook apart is the massive data pool, the high level of user engagement, and a platform environment where users are open to consuming content curated by algorithms.

How it works for a New User:

Upon joining Facebook, a user provides some basic details like age and location. When they first engage with Reels, they’re likely to see some of the most popular and trending content, particularly those that resonate with their demographic profile.

  1. As users interact with these videos → whether by liking, sharing, following the creator, or watching more of their content
  2. Each of these actions sends signals to the algorithm about their preferences.
  3. The more users interact with Reels, the more refined the content suggestions become, with the algorithm better predicting what they’ll enjoy seeing.

The Facebook Reels algorithm hinges on a few crucial elements or ranking factors:

Engagement

This includes likes, shares, comments, and, crucially, the amount of time spent watching a video.

Extended watch time is a particularly strong signal that content is resonating with the viewer, influencing how similar content is served in the future.

User interactions

The people you follow and engage with can significantly impact the content presented to you on Reels.

Video Details

Aspects like the video’s origin (whether it was made on Facebook or another platform), the content in the caption, and any relevant tags or embedded information.

Device & account settings

These include factors like location, language settings, and device type, which play a role in content recommendations, though they are not as heavily weighted.


All these elements work together to help users discover fresh and relevant content. One of the defining features of Facebook’s Reels algorithm is its focus on content relevance over the popularity of the creator. This approach means that even if you’re new to Reels, your content has the potential to reach a large audience if it resonates with viewers.

Tools for DiscoveryContent not showing
Relevant tagsFlagged as inappropriate or harmful
Keywords in captionsMarked as “not interested”
Popular search termsAlready watched

Want to schedule to post Facebook Reels? We spent 4.5 months finding out what are the best times to post on FB Reels.

Pro Tip: SendShort can create and schedule Facebook Reels for you!


5 Tips: Win Facebook Reels’ Alogirthm

1. Match the Standards

Facebook Reels thrives on quick, captivating videos — therefore, you should aim for 15-30 second clips that grab attention immediately. Use vibrant visuals, dynamic editing, and compelling storytelling to keep viewers engaged from start to finish.

Infographic showing the size of Facebook Reels
Respect the FB Reels Dimensions

The more people watch your Reel to the end, the better it will perform in the algorithm.

  • Start with an attention-grabbing hook within the first 3 seconds.
  • Keep the pace fast, using quick cuts and transitions.
  • Use captions or text overlays to highlight key points.

2. Hop on Trends

Stay on top of trending audio clips and hashtags for Facebook Reels.

Incorporating popular sounds or music into your Reels increases the chances of your content being pushed to a wider audience.

Looking up 'stanley cup' in Google Trends
Google Trends helps you find topics
  • Regularly check the ‘Hot Topics’ section for new sounds.
  • Use a mix of broad and niche hashtags for better reach.
  • Align the audio with the theme of your video for cohesive storytelling.

3. Put out HQ Content

Turn long videos into shorts, or just add captions
Use SendShort to improve your Reels

The algorithm favors content that is visually appealing. Invest in good lighting, stable shots, and clear, high-resolution video. Even if you’re shooting on a smartphone, these small details can make your Reels stand out and encourage the algorithm to prioritize your content.

  • Use natural light or ring lights for clear and bright visuals.
  • Avoid shaky footage by using a tripod or stabilizer.
  • Edit your video to enhance colors and clarity.

4. Ask for Engagement

Engagement is key to boosting your Reels in the algorithm. Ask viewers to like, comment, and share your video.

Posing questions, encouraging reactions, or even a simple call to action can increase interaction, signaling to Facebook that your content is worth sharing.

  • End your Reel with a direct call to action, like “Comment below!”
  • Use polls or questions in your captions to spark conversations.
  • Respond to comments quickly to boost engagement.

5. Consistency is Crucial

Posting consistently helps you stay on the algorithm’s radar. Develop a posting schedule that keeps your audience engaged without overwhelming them.

Regular uploads show the algorithm that you’re an active creator, which can lead to more exposure over time.

  • Experiment with different types of content to see what resonates.
  • Create a content calendar to stay organized.
  • Post at optimal times when your audience is most active.

FAQ

1. Is there an algorithm for Facebook Reels?

Answer: Yes, Facebook Reels has an algorithm that prioritizes content based on user engagement, relevance, and trending topics.

It favors Reels that quickly capture attention, keep viewers watching, and encourage interaction through likes, comments, and shares.

2. How does Facebook determine what reels you see?

Answer: Facebook determines which Reels you see based on your interaction history, including likes, comments, and shares, as well as your viewing habits and interests. The algorithm also considers trends and the popularity of content among users with similar profiles.

2. What makes a FB Reel go viral?

Answer: A Facebook Reel goes viral when it features highly engaging content, resonates with a wide audience, and leverages current trends.

Key factors include a strong hook, shareable elements, high-quality visuals, and effective use of hashtags.


Thanks a lot for reading this,
David Ch
Head of the Editing Team at SendShort

About the author

David leads the editing team at SendShort. With this help, the team delivers the latest guides on using your favorite social media apps and creating short-form content.