Hey, I am getting more and more interested about the technical workings of facebook. However, I have completely failed on trying to find any good books/resources out there on mr. internet. Most of my searches produce a "how to use facebook" for the target audience of the 80+ year old computer illiterate.

I would be interested on almost anything anyone can dig up including high level ideas (such as php frameworks, design philosophies, server load balancing strategies) to low level workings of how they implemented certain features (or even some pseudo code).

Links, books, google queries, your 2 cents of info/speculation will all be greatly appreciated. If it pertains to facebook, I would be interested in reading about it. Thank you.