I was about to write a comment on facebook and other web 2.0 services with respect to privacy. Fortunately I can save my time and point you to Andy Wingo’s article
on just this topic. Actually his ideas are an outcome of our GNU Hackers Meating back in November. It is a call to think about extending the GNU project into the connected world where the boundaries between machines are vanishing and a computer user does not anymore know where his private data is stored or made available.
A computer user shall not only be in control of his box but also in control of his data – the user is the only one to decide which data shall be published, given only to friends or kept private.