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Facebook is much more than just a PHP website. They don't store and process billions of image files with PHP and MySQL.
Also they didn't just convert some PHP to C++. They wrote a serious converter that takes PHP and writes C++ which is then compiled.
There is Objective C, C++, Java, Ruby, JavaScript, Python and more. I wouldn't bet against there being some Scala in there. Not sure if they use any Microsoft languages or frameworks outside of client libraries though.
They made Cassandra, Varnish and other projects. Check out their github page github.com/facebook.
p.s. I'm no fan of Facebook the service but they are a serious engineering outfit with some impressive technology behind them.
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Rutvik Dave wrote: also it is interpreted so I cannot sell my stuff easily
You can bytecode compile it very much like how ASP.NET compiles down to IL. It's just generally not free to do so, as such most people don't.
Jeremy Falcon
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