How does Facebook work?

OK, you coders and developers.
Telecrunch has the scoop of the month with the revelation of the publication of the Facebook Source Code.
It has been published at a single-post website, meaning, it was created for the sole purpose of revealing the code. It also means that the website will probably be a short-lived one.

The source code reveals a lot about the structure of the application, and the practices that Facebook developers follow. From just this single page of source code a lot can be said and extrapolated about the rest of the Facebook application and platform. For instance, the structure doesn’t follow any object oriented development practices, and it seems that the application is one large PHP file with a large number of custom functions living in the same namespace (they also seem to be using the Smarty templating engine).

So, I grabbed a Copy. Heh™