Grokking the System Design Interview, Volume II
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Step 6: Detailed Component Design

A wire service publishes the report "NASA sets a date for the next Moon landing", and within an hour twenty newspapers carry it, each under its own URL and headline. Maya follows the topic Science, which has 5 million followers, and the entity NASA (a specific organization, person, or thing a user can follow), which has 8,000. She should see the story once, near the top of her feed, within seconds, and her phone may buzz if she asked for alerts.

That one story raises four questions:

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