Gilles Ganault wrote:
> On Sun, 17 Feb 2008 12:31:17 -0800, Animesh K <animesh1978@gmail.com>
> wrote:
>> I am not sure about the back-end, but at the front end, Facebook uses
>> Php and JS. Signing in takes you to the page below. Facebook's
>> popularity can be judged at Alexa.
>
> BTW, if I include some JS libraries/components in each page, are they
> cached by the browser so that it doesn't need to download those files
> again the next time?
>

Maybe, maybe not. It depends on the browser, the options the user has
set, and even possible caching by ISP's between you and the client.

The only think you know for sure is it's something you have absolutely
no control over.

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