Facebook has over 1 billion active users, processes trillions of actions per day, and stores billions of photos. It scales horizontally across many servers and caches to handle this large traffic. The interconnection of user data means failures can cascade, so Facebook focuses on reliability through techniques like shedding load during outages to minimize impacts and doing post-mortems to prevent recurrences.
3. # property on the Internet (time on site)
s of billions of monthly page views
> trillion feed actions processed per day
s of millions of cache queries per second
Over trillion objects cached
Over million active users, half log in every day
billion photo files stored
Over billion minutes spent every Day
Over billion pieces of content uploaded every week
6. Over million active users per engineer
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Facebook Google* Amazon* Microsoft*
* Conservative estimates based on publicly available data