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Some of the data here is a little suspect. Example "programming languages":

http://wappalyzer.com/categories/programming-languages

It says 90% of the web uses PHP, 8% Java and 2 % other.

I suspect it just looks at extensions. .php and .jsp are easy to spot, as is the PHP HTTP header, RoR's utf8 tick is harder, and node.js apps and such are probably impossible.

That's only according to their analytics - not a real situation. It means that the users of Wappalyzer currently visit mostly those websites, nothing else.

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