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> I've no complaint with this, but it leads to the mistaken impression that great applications are written in dynamic languages

Right, except for Facebook, Twitter, Reddit and Wikipedia (yes, Facebook has a different PHP runtime which uses gcc to get a performance boost, this is an irrelevant implementation detail).

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Twitter was Ruby but moved to Java.

The last thing I know was they moved from Ruby to Scala. Did they move to Java without me noticing or do you mean Scala by Java (since it's a JVM language too)?

EDIT: according to Wikipedia the service itself moved from Ruby to Scala while search moved from Ruby to Java.

Twitter was Ruby but moved to Scala and Java :D

Twitter's frontend is still all Ruby/Rails. The Ruby -> Java claim is common, but incorrect. (Source: I know multiple engineers in SF who work there.)

A lot of their backend stuff is now Java, though.

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