Algorithm
The ranking system a platform uses to decide which posts each person sees and in what order. Modern feeds predict how likely you are to watch, like, share or skip every candidate post, then sort by those predictions.
An app rarely has just one. Instagram runs separate systems for Feed, Stories, Explore and Reels. TikTok describes five steps for For You: selecting eligible videos, predicting interactions, ranking, a similarity check and recommendation rules. X has published the code for its For You feed, including weights for predicted likes, reposts and replies.
They share two habits. They lean heavily on how viewers behave with each post, and TikTok says follower count isn’t a direct factor at all. They also filter out content that breaks recommendation rules before ranking anything.
Tip: treat your analytics as the algorithm’s feedback. Watch time and shares tell you more than likes do.
Guide: how tiktok algorithm worksGuide: how instagram reels algorithm worksGuide: how x trending topics work