Things about facebook:
1) FB is where you add people you don't greet when you meet in the real life
2) Thru FB you discover the name of your colleagues and classmates for the first time
3) Now that you added the above mentioned in point 1) and 2) you have to remember their name when you meet them and show that you have always known their names
4) I don't add people whose name I don't know if there is no clear picture of them.
5) Always put as a profile picture a big picture of your face rather than a group picture. When people are tryin' to recognize you they will see a picture the size of a stamp, so....