Design a Like Counter · System Design Interview

Design a Like CounterDesign the service behind a like button: people like and unlike posts, and every post shows how many likes it has and whether you liked it.What it has to do

Like and unlike a post, once per user

Show the like count of a post

Show whether the current user has liked a post

Scale

Likes and unlikes per day: 2 billion

Posts: 10 billion

Out of scope

Who the likers are in detail

Notifications to the author

Ranking posts by likes

Spam and fake accounts

Practise this challengeAll system design challenges

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