There is this idea that Facebook is just for entertainment, friends and family contacts. Robert Scoble already demonstrated that in fact Facebook can be used to create great lists, even more so than Twitter. Of course you can find interesting groups about any subject on Facebook, or follow media. I am aware of the privacy discussions and I don’t want to suggest Facebook is the ideal network, far from it. But it’s like a huge city, and while one can object to the policies of the city, huge cities remain places for innovation and creativity.