a question about Facebook

Hey all,
I’ve got a question about Facebook. I’ve read in an article that Facebook could also be written with C++ and would work more efficient than what’s currently happening. I’ve heard of numbers with 75% reduction in for example servers. I would like to ask the experts here for their opinion.
What are the parts you -can or should- write in C++ instead of PHP looking at Facebook. Or can you completely create their service with C++?
Is it true that the systems will run much better/efficient when there is more C++ in Facebooks service?

What are the downsides when you develop a web service in C++?
Hope my question didn’t irritated you too much and thanks in advance for your time!
A cgi program written in C++ can be used to generate a webpage in any circumstance where PHP can be used
But that would be faster only if the generated contents of the page is hardcoded in the C++ source.
Having to modify and run many programs from source wouldn't be anywhere more efficient than C++.
C++ isn't meant to be used for program which only produce web pages, each task should be performed by the appropriate tool, in this case PHP
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