One aspect I do like on Facebook is how it has been used to try and find missing people. I was sent a message from a friend on Facebook and it was a request from a mother looking for her missing son. I immediatly sent it out to all my friends and instructed them to do the same. Big difference from that and using it to look for criminals though.

I don’t think you make it very clear why your concern comes from an application aimed at law enforcement, and not from the far more nefarious corporate spying that has become (largely) so acceptable on Facebook. I appreciate you do raise concerns, but surely the intentions behind GMUpdate are far better natured than, say, Blockbuster.