It is also a place where people upload hundred's of photos of themselves in the hope that someone may think they're cool.
Mary: I'm going straight home to upload these photos to my facebook. I'm soooo cool!
Y is now single.
X is an idiot and he's still in a relationship.
Y is now interested in "Women" and "Men"
X is Y YOU'RE A SLUT!
Y is I facebooked your mom X.
Y is now in a Open Relationship with X's mom.
2) An elite version of Friendster, a less teeny-bopper and cleaner version of Myspace
3) An actual book of students' pictures and contact information at many colleges. May or may not be limited to the incoming freshman class, depending on the college. Often found at top tier universities.