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Design a system that displays personalized messages showing which friends have played a specific game along with the total player count, similar to Roblox's game page feature handling hundreds of millions of users and tens of millions of games.
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Roblox
Design a friend activity system for a gaming platform
Reported Jan 16, 2026 · 5 source reports
PRINCIPAL, SENIOR, STAFF
Source snapshot: Nov 12, 2026
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