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31
votes
6answers
14k views

Why does Facebook convert PHP code to C++? [closed]

I read that Facebook started out in PHP, and then to gain speed, they now compile PHP as C++ code. If that's the case why don't they: Just program in c++? Surely there must be SOME errors/bugs when ...
2
votes
1answer
2k views

How does Facebook calculate mutual friends?

How does Facebook calculate mutual friends? Does it cache all mutual friends for each user? Does it use MySQL to calculate mutual friends with a query?