With Facebook opening up all its gubbins, it means that developers can make all sorts of apps to interact with data on Facebook. One such app is Openbook, a search engine that interacts with Facebook's publicly available API to allow you to search Facebook users status updates. The guys who developed this search engine did so to make a point about Facebook's privacy policy - it search those status updates that have been left viewable by everyone in the FB pprivacy settings.
From a brand point of view though, it is a great way to track conversations about companies and products in Facebook. Here's one I did for my client Durex.
Its not totally comprehensive as not everyone leaves their status update privacy settings open, but it gives you an idea of what's been said.

