Some info on Youtube architecture
http://video.google.com/videoplay?docid=-6304964351441328559

I know facebook uses these:
http://en.wikipedia.org/wiki/Apache_Hadoop
https://github.com/facebook/hiphop-php/wiki

You can get the number of servers of major sites here
http://venublog.com/2008/04/16/notes-from-scaling-mysql-up-or-out/

Though its no old data

These are good places to start, most of these major companies internal architecture is secret for obvious security and copyright purposes so you might not get
detailed credible info on the inner workings but you can get a rough idea on how to build your own scalable code.


----- "Evans Ikua" <ikua.evans@gmail.com> wrote:
> Anyone with an idea about what the major social networks and other large IT deployments are using? Say, how many Data centres, servers etc is facebook deploying? How about Twitter, Google, Utube? What are they running on the servers?
>
> Evans
>
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