This is also what prompted my to try and start a discussion about privacy over here: http://news.ycombinator.com/item?id=1341227
From the search api docs:
You can search over all public objects in the social graph with https://graph.facebook.com/search. The format is:
https://graph.facebook.com/search?q=QUERY&type=OBJECT_TY... We support search for the following types of objects:
All public posts: https://graph.facebook.com/search?q=watermelon&type=post People: https://graph.facebook.com/search?q=mark&type=user Pages: https://graph.facebook.com/search?q=platform&type=page Events: https://graph.facebook.com/search?q=conference&type=even... Groups: https://graph.facebook.com/search?q=programming&type=gro... You can also search an individual user's News Feed, restricted to that user's friends, by adding a q argument to the home connection URL: