chewy - 7:09 pm on Apr 25, 2010 (gmt 0)
You might note that Google Guy (whoever that was) once fleed WebmasterWorld.
Years ago, a quick view of orkut was really interesting when I figured out how to view friends of key people here on WebmasterWorld.
I felt like I was eavesdropping. I never went back.
I could easily find out who was friends with whom, what their real names were, etc.
The bottom line - if you want privacy in the age of social networking tools - you have to work VERY HARD for it.