At work we advise all our staff to be cautious about what goes on facebook, bebo twitter, flickr etc. I did a random trial and googled the name of someone who emailed me. She is an ordinary civil servant who I may or may not meet at a meeting at the end of the year.
But look on Google images and I found her taking camera phone images of herself in underwear. Not indecent but maybe not what she wants work colleagues seeing?
Google your own name and check!