Social Sites

Facebook facinates me. I have friends asking me "How does it work?" often. Most often they are asking can everyone on Facebook see everything I post? It does amaze me how many of use this site. Almost every patron gets on it or on My Space everytime they use the computers. I would like to learn how to help people use it and get better myself especially where they want to use it professionally and for employment etc. Words of advice though.......don't let Facebook etc. run your life! Make sure you live and interact with others face to face!