Resources: FAQs

Most product teams face a common challenge: app users report they love using the product, but they don’t open it consistently. That’s a stickiness problem. Stickiness measures how often active users return within a given window. In this guide, we answer the common questions about measuring, diagnosing, and systematically improving daily app engagement rate. What

If left, then no hard feelings. Maybe there are better app tutorials out there for you. If right, then great! Let’s start learning. Tinder processes 1.6 billion swipes per day across 75 million monthly active users. It may look like a simple swipe-the-card-for-a-chance-at-love game, but behind that deceptively simple interface sits real-time event processing, geosharded

That was Discord’s selling point when it launched back in 2015. It was chat made for gamers who were sick of paying for TeamSpeak and sick of Skype eating their CPU. That pitch worked for a lot more people than just gamers. Now, your company or community might use Discord for coordination, running customer support,

Bandwidth. Specifically, the cost of moving video segments from your origin servers to every concurrent viewer. It accounts for 50–70% of total infrastructure spend, and unlike transcoding or storage, it scales linearly with audience size. This is why Twitch has never turned a profit despite generating roughly $2 billion in annual revenue, and why it

In 1966, ELIZA became one of the first computer programs designed to simulate human conversation. It didn’t understand language and simply matched patterns to return preset replies. Over the next several decades, most chatbots followed the same rule-based approach. They operated using decision trees that are structured conversation paths where each user response triggered a

A single chat message traverses DNS resolution, TLS negotiation, WebSocket framing, server-side fan-out, database persistence, push notification relay, client deserialization, local storage, and UI rendering. Any link in that chain can spike from milliseconds to seconds, and the spikes compound unpredictably. The difference between a chat system that feels instant and one that feels broken

We’ve all been there. Our incredibly witty, insightful post being shared worldwide by millions, or our painstakingly created meme being fought over by competing celebrity accounts. What, wait, you haven't found online celebrity success? OK, so you might not have caused the “fail whale” on X back in the day, but we’ve all seen it

“This is a very tough problem.” That’s from the top answer on Stack Overflow for this question. Granted, the answer is over 15 years old, but the sentiment is still true. This is a very tough problem. The problem stems from the fact that audio and video travel through completely separate pipelines in a real-time