Design
Twitter / X
Design a Twitter-like social platform supporting tweets, follows, timelines, trending topics, and notifications at massive scale.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
It's a benchmark large-system LLD/HLD hybrid — interviewers use it to see whether you know fan-out strategies for the "celebrity problem" (millions of followers) rather than one-size-fits-all logic.
02 - Where this system exists in the real world
You interact with this design every day.
Twitter/X-style microblogging platforms
Public figure/brand social broadcasting systems
Real-time news and trend aggregation platforms
03 - What you'll master
Solve this once. Know it forever.
Design fan-out-on-write vs. fan-out-on-read
Handle extreme skew (celebrity accounts)
Model timelines, likes, retweets, and mentions
04 - What you'll design
7 functional · 5 non-functional requirements.
Post tweets (text up to 280 chars, images, videos)
6 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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