Jaiku [1] is a micro-blogging site similar to twitter but with some more features. The Jaiku API [2] exports some it’s data in json. Sioku [3] is a service to translate the exported data to RDF using SIOC [4] for posts and FOAF [5] for friends. So for a specified jaiku user you can get a SIOC export of their posts and a FOAF export of their friends.