Live Journal now supports Friend of a Friend feeds. Go to http://www.livejournal.com/users/username/data/foaf for an example.
You’ll get back a list of all the Live Journal accounts that the user has ‘friended’, along with the links to their FoaF and Journals.
You can also get syndication feeds at http://www.livejournal.com/users/username/data/rss and http://www.livejournal.com/users/username/data/atom.
So you have enough to start building an interesting application with all that data.
