Just finished (for the moment) a small application that can be used for social network analysis of Friendfeed data. See for example this visualization of my Friendfeed contact network.
The application loads your contacts and your contacts’ contacts from Friendfeed and not only displays your number of friends and friends-of-friends but also the five most influential people in your network. Influence is defined as the number of incoming links a person has - like Twitter followers, but only within your FOAF-network. I also added a small chart that shows the relation of your direct contacts to all the people you can use via your friends.
The script is located here. But especially for people with lots of contacts, this can take quite a while because all contacts not in the cache must be downloaded via the Friendfeed API. If anyone’s interested in the PHP code, send me a mail and I’ll send it to you.