This site a parody of facebook, (openbook) is pretty neat - it allows you to search all facebook updates - just try "My new number"
some of the stuff you can find there is amazing - people generally have no idea how the web works and in particular how facebook privacy settings work.
although they claim no connection with facebook this is their headline:
Facebook helps you connect and share with the people in your life. Whether you want to or not.
# What is Openbook?
Openbook lets you search public Facebook updates using Facebook's own search service.
Facebook's bait-and-switch on privacy and their overly complex settings cause many users to post messages intended for their friends to 'everybody'.
That's the entire planet, for all time. This privacy-malfunction could have serious consequences if you're looking for a job, applying for college, or trying to get medical insurance.