When I first signed up for facebook, it was obvious to me that it was a walled garden taken from the same mold as AOL or Prodigy. Facebook allows you to import things to facebook, but they never allow data to escape except to humans. As an example, I’m writing this on my blog, but it will soon be copied to Facebook with relatively little trace of how to find my complete blog site of sigcrap.org. The reason for this is obvious – they want the advertising dollars that can come from human attention.
So long as people knowingly turn over data to facebook, I see no problem with it. We should be clear however that Facebook is not an open platform, and Facebook is not likely to encompass every activity you might want to have.