If what I've read is true, lots of places. A school teacher in my area just got fired for making a student give access to his/her Facebook account which the teacher used to punish students who had talked about the teacher.

I've read about police and city agencies requiring social networking passwords to be given up. Same for departments of corrections. Here's a photo of a job application for a clerical position at a police dept: http://i.imgur.com/hWsZT.jpg (From this reddit thread: http://www.reddit.com/r/WTF/comments/mtenb/wife_came_across_...)

It's apparently quite common. The real kicker is when they also include a non-disparagement agreement in the hiring process, so that they can easily fire you for non-publicly posting about your job.

I have accounts on around 200 sites. Would I need to list every single one?

First link in the story: http://www.zdnet.com/blog/facebook/employer-demands-facebook...

Schools are breeding grounds for this sort of thing.

Combine psychotic parents, "cyber bullying" (a crisis de jure), morals clauses in contracts, "think of the children" attitude, and sometimes tyrannical administration, and you get crazy stuff like this.

I've heard Israel does that sometime in the immigration controls.