let's start with the obvious and work our way down to the more obscure.

• spend all your time checking it over and over again
• start to stalk people
• get overly concerned about past, present, and future boyfriends [crushes work too]
• slooowly chat
• friends pile up... but never go away when you stop talking to them for a prolongued period of time --> you're friends with a bunch of people that you don't know anymore
• you start to collect friends
• your email inbox is flooded with facebook
• your profile is full of JUNK and you can't be bothered to get rid of it
• you end up being friends with people you don't like... just to stop them from bothering you
• start thinking only about the past, don't move on into the future
• your PARENTS get facebook, and you get creeped out
• privacy? what privacy? everyone knows anything and everything about you
• you end up stalking even people you didn't know or maybe even disliked throughout all your years
• you friend just anyone, you don't even have to know them.
• impersonal-- can just send someone a happy birthday note and you don't even sincerely mean happy birthday. their birthday is not important enough for you to remember otherwise.
• less motivated to GO OUT AND SEE PEOPLE when you think about them
• become a camwhore-- just to put pictures on facebook, and they're all the same, too.