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I find it interesting how easy it is to criticize a functioning system based on some aspect of non-conformance with some hypothetical ideal. The idea that HN wouldn't run on a database is no less astounding than the idea that much of facebook runs on PHP. Design of real systems is often messy and imperfect and deviates from the ideal due to necessity of optimizing one or another factor that may not be obvious.

Facebook doesn't run on PHP and hasn't for a while... Its compiled C.

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