Joi Ito talks about some privacy concerns w/ some current implementations of social software.
Social Software needs to show the seams
“I think when you are dealing with sensitive privacy related information, your UI has to make it very clear where your data is, when it is going to be transfered to another machine, and what the privacy policy of the said machine is. Every time data moves across a boundary, the user should know this an be provided a choice. UIs that deal with personal information should be about showing the seams, not being seamless.”