There used to be an option to export to CSV. Looks like they got rid of it. The fact that they are actually removing functionality says something.
A couple years ago I exported all my Facebook contacts into a mind map using FreeMind. I then sorted all of my friends according to where I met them. So for example, a possible node location would be College -> Classes -> CS100 -> John. Then if a person had introduced me to more people, those new people would fall under that person. Not only was it useful as a visual rolodex, but it was also useful for visualizing which people and organizations were the most socially productive for me.
I used to use an app called facebook sync. It synced my facebook account with my mac address book and phone. I had all my friends phone numbers kept up to date with no hassle. The application got banned last week and now I'm annoyed at facebook. As much as I like facebook I want to take that data with me sometimes, not even to go join a rival network!
I've had my GPG key on my website for the last four years and I've yet to receive an encrypted email. But at least I've been able to test it by sending encrypted emails to myself, which makes my GPG key about an order of magnitude more useful than FOAF.
A couple years ago I exported all my Facebook contacts into a mind map using FreeMind. I then sorted all of my friends according to where I met them. So for example, a possible node location would be College -> Classes -> CS100 -> John. Then if a person had introduced me to more people, those new people would fall under that person. Not only was it useful as a visual rolodex, but it was also useful for visualizing which people and organizations were the most socially productive for me.