Why TikTok's algorithm is likely driven by what you linger on

TikTok's personalized algorithm activates the brain's reward system

A 2025 Washington Post study found that 75% of the TikTok users it studied nearly doubled their time spent on the app within a month. Experts in design and psychiatry say this is due to the app's interface and algorithm, which, after learning about the user's preferences, recommend videos more likely to activate that person's dopamine reward system than non-personalized suggestions.

Less than half of TikTok's US users have posted a video

Like most platforms, content is driven by a small number of active users—in TikTok's case, 25% of accounts are responsible for an estimated 98% of content posted.

The average TikTok user spends 95 minutes on the app per day

According to HubSpot, the average TikTok user spends 95 minutes per day using the app, and an estimated 90% of users access TikTok daily. TikTok also has the highest average session length among social media platforms: Its users spend almost 11 minutes per session.

How TikTok ate the internet

TikTok is now deeply integrated into American culture, thanks to the app’s powerful algorithm and focus on entertainment which have influenced popular trends and social media content consumption in the US. This immersive piece highlights TikTok’s role in helping shape everything from music to fashion and even politics in the US—while its connection to China has also drawn scrutiny and raised national security concerns.

TikTok CEO Shou Zi Chew on its future

TikTok CEO Shou Zi Chew dives into how the trendsetting video app and cultural phenomenon works, from what distinguishes its algorithm and drives viral videos, to the challenges of content moderation and digital addiction in this wide-ranging conversation with the head of TED, Chris Anderson.

How to read the news on TikTok

There's plenty of news on TikTok, but that doesn't mean it's all reliable. This guide, written by a communication technology professor, breaks down the ways the app's algorithm delivers news. It also covers how users can determine whether or not a story is factual or misleading. Most strikingly, the professor warns readers that if they didn't search for a TikTok video, then "it probably found you."

TikTok's algorithm has changed the way hits are made

Songs aimed at TikTok's algorithm—designed for viral dances or soundtracking common experiences—often find success on the Billboard charts. An early example was Lil Nas X's "Old Town Road," which used his memes and a country-trap beat from the Netherlands to rise to the top of the Billboard charts.

Understanding TikTok-owner ByteDance's business model

ByteDance has ridden TikTok's major success to become the world's most valuable startup. This deep dive showcases some of the company's smartest moves and tactics, and where it's headed next.

YouTube's recommendation algorithm relies on over 80 billion daily pieces of information

These signals include which videos a user has watched, searched for, and liked, as well as channel subscriptions and feedback selections, such as videos marked "not interested." Each user's viewing habits are compared with those of other users with similar habits, and this information is used to suggest additional content.

Learn how the algorithms behind Tinger, Bumble, Hinge, and other dating apps work

Formerly based on the Elo rating system, which ranks chess players, the Tinder algorithm is built on user data, with more time spent on the app providing more data on user preferences from which to customize potential matches. OkCupid's match percentage algorithm relies on overlaps in users' search preferences and responses to a subset of over 4,000 questions.

TikTok's 'sonic logo' imprints the app's identity across platforms

As the app's popular videos spread to other platforms like Instagram and Reddit, the company sought a way to alert viewers that the content originated on TikTok. They decided on the sonic logo that now acts as a bumper on all of its shared videos, to attract users.

How the YouTube algorithm works, according to MrBeast

In this brief interview clip, the YouTube savant "MrBeast" summarizes how the YouTube algorithm—which he relies on to make his content go viral—actually works.

Facebook's algorithm chooses content to display on the News Feed based on user data

It employs machine learning to prioritize posts and ads based on user interactions, content type, and post timeliness, creating a personalized, engaging experience for each user.

Why TikTok loves Rainer Maria Rilke

It seems like an odd fit: A social media app known for bite-sized videos and a long-dead Austrian poet. Despite the odds, Rilke, especially his famous "Letters to a Young Poet," has become an unexpected trend on TikTok, where influencers share his wisdom on creativity and self-discovery.

Watch how algorithms can be designed to train themselves and self-improve without human input, to the point where the optimized code is too complex for programmers to understand.

Explore Wikipedia, but TikTok-style

Wikipedia's vast trove of information can be a bit dull to navigate. This homemade website takes real Wikipedia pages and places them in a swipeable format similar to TikTok, so you can learn about very random things in a similar mode as the culture-shifting TikTok app. Check it out here.

Meta has added video features to attract more young users to Facebook

Amid an aging userbase and competition from newer social networks like TikTok, Facebook has seen its perceived relevance and cool factor progressively decrease. The Local tab and dating features are among several efforts to counter this perception.

Here is a visualization of the creator economy as an ecosystem

From social media platforms like Instagram and TikTok, to major advertisers paying influencers to promote their brands, to the consumers watching online content, quite a few engines have to keep firing to make the creator economy run smoothly.

Threads offers sleek design but fails to deliver X's unique user experience

Despite its smooth setup, Threads lacks the algorithmic depth and cultural edge that made X (formerly Twitter) feel essential to longtime users. The overlap with Instagram contacts creates a less authentic space, limiting the raw, real-time energy people loved on X.

How Spotify creates niche genres

One of Spotify's most recognizable features is its playlists. The provider offers an endless stream of strangely titled mixes with names like "Hyperpop," "Phonk," and "Lorem," which suggest uniform genres and scenes despite featuring seemingly random assortments of artists and songs. This article unpacks why Spotify organizes its music in this way and how, unintentionally, the process erases organic movements that developed outside of the app.

Watch how algorithms can be designed to train themselves and self-improve without human input, to the point where the optimized code is too complex for programmers to understand.

How companies track you around the internet, explained

Being able to track how users behave on websites is a massive opportunity for companies to hone their products, target their ads, and more. Dozens of trackers are on the average website you visit, depending on how you deal with that site's cookie policy, and Google is the chief tracker of them all. Learn about these companies and what they are tracking with this informative blog visualization.

Netflix profits when you're not watching, and its movies are designed that way—read a detail-rich critical essay exposing lesser-known Netflix takes

Peloton's success is partly due to users' relationships with instructors

Despite Peloton's online model, most users feel a deep connection with the instructors and have created community groups around their shared identities (like being a mom or a lawyer). The relationship users have with their instructors has fueled consistent engagement and paved the way for instructors to take on personal brand deals. (Some users may experience a paywall.)

Fast-casual restaurant Chili's is experiencing a resurgence, with its parent company recently reporting a nearly 32% increase in sales, thanks to passionate Gen Z fans on TikTok.

The dead internet theory suggests that mostly bots are interacting online

The dead internet theory proposes that bots create most online content. These bots are believed to create social media posts to boost engagement and increase advertising revenue. However, the accounts doing the liking and commenting are also believed to be bots. The theory suggests governments use bots to manipulate public opinion.

'Context rot' explains why AI conversations degrade the longer they run

Research shows that as a large language model's context window fills up, performance declines, and models begin over-indexing on content at the start and end of a conversation while losing track of what's in the middle. The practical fix is simpler than you'd think: start a fresh chat more often.

Statcast runs machine learning models in the 23-second gap between every pitch

The same Hawk-Eye cameras that track spin rate, exit velocity, and sprint speed also feed proprietary team models that update in near-real time. Some organizations have built streaming pipelines to surface insights mid-at-bat before the next pitch arrives.

This site reaches millions of visitors who are tired of AI chatbots and seeking human connection. Pretend to be an AI chatbot and ask questions, provide answers, and draw for people in real time.

Children are now three times more likely to say they want to be a YouTuber when they grow up than an astronaut, with some even attending 'YouTube camps' that teach kids how to create content for the platform.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

Hear 50 years of iconic hip-hop samples, the genre's foundational looped tracks

Researchers believe the brain consolidates memories, processes emotions, and plans for the future during dream states

Crows are believed to have intelligence on par with a seven-year-old child and demonstrate complex behaviors, from problem-solving with tools to recognizing human faces.

Learn how your body is, scientifically, like a firework with its own slow, controlled burn.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

In 2025, four executives from large tech companies were given positions in the US Army Reserves—including Palantir Chief Technology Officer Shyam Sankar, which reinforced Palantir's ties with the US military and its role as a leading defense partner.

Memecoins are a type of cryptocurrency—a form of digital currency with a wide variety of uses—created around popular 'memes,' or viral internet jokes.

Browse a detailed visual analysis of over 200,000 similes—comparisons that often use 'like' or 'as'—from popular fiction to see how frequently writers the same idiomatic expressions.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

US consumers collectively owe more than $1T to credit card companies—almost as much as they owe in auto loans.

Explore chaos in this simulation of two double pendulums, where small differences in the release angles produce wildly different outcomes.

Tattoos remain visible on your skin thanks to immune cells called macrophages

Explore the animals that populate the depths of the ocean, from fish and coral in the first few hundred feet, all the way down to the bottom of the Mariana Trench.

SpongeBob exemplifies Aristotle's philosophy for living well because he understands that happiness doesn't come from external factors like money, recognition, or power.

Dorothy's famous entrance into Oz in 'The Wizard of Oz' relied on analog tricks, including a body double and sepia-toned paint, as much as it did on technology

Budweiser stores yeast derived from the original 1800s strain in a secret bunker, which only the Head of Yeast Management can access—not even the CEO

To reduce wrinkles in clothing, research recommends gentle wash cycles with more water and tumble drying with smaller loads and longer times.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.