This chapter was very detailed. I think a little too detailed. However it was still interesting to learn about what happens behind the scenes of something I use everyday. I sometimes think about writing an application for Facebook, but I either don't have time or lose interest.
One of the main reasons why social networking sites, like Facebook, are very helpful to other applications is that is a very easy was to extend the functionality of them with little extra work. Facebook has lots of data on lots of different users and this information is very valuable. The book example in this chapter is a good one. The information found in Facebook could point me to another user with the same interests as me and new authors and books that I never heard of.
FQL was used to optimize service calls by reducing the actual number of services calls needed to obtain data. It did this in a way that is familiar to many developers. A query request is returned as tables and fields just like SQL. It also goes through the security services to ensure the data is not being accessed by unauthorized uses.
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