How Algorithms Work — Why You See What You See

Social media platforms are some of the most profitable companies in the world, yet they don't charge you a fee. Ever wonder why? It’s because you aren't the customer. You are the product being sold. Your attention is the most valuable resource you have, and these platforms are engineered to capture and sell as much of it as possible. Your feed isn't a window to the world; it's a billboard designed specifically for you.

An algorithm is a complex set of rules a computer uses to decide what to show you. On social media, its main goal is to maximize your time on the platform. More time means more ads, which means more revenue. This is the core of the attention economy.To achieve this, algorithms prioritize content that gets high engagement (likes, comments, shares). Research shows that content triggering strong emotions—especially anger and outrage—spreads fastest. This is why you see so much shocking or divisive content. It’s not a mistake; it’s the business model at work.This can create a filter bubble, an echo chamber where the algorithm only shows you content it knows you'll agree with. Over time, this can distort your perception of reality and make it seem like everyone thinks just like you.Features lik...

For a class project, Isabella (17) decided to test the idea of a filter bubble. She created two brand new accounts on the same video platform. On Account A, she only watched and liked videos from left-leaning political commentators. On Account B, she only engaged with content from right-leaning ones. She spent just 15 minutes a day on each for one week. When she presented her findings, she showed the class two completely different homepages. Account A’s feed was full of protest videos and social justice explainers. Account B’s was filled with clips about economic freedom and critiques of mainstream media. It looked like they were from two different planets. Isabella realized an algorithm could build an entire reality for someone without them ever knowing what they were missing.