No 6. Comment on religion or politic
No 5. Give you full birth date in info
Displaying your full birth date is one of the best ways to have your identity stolen. Using your birth information, identity thieves could obtain more information about you and potentially gain access to your bank or credit card account. You should probably change this quickly; go to your profile settings and atleast opt to hide you year of birth. Having no birth information is best, without question.
No 4. Use excessive emoticons
And by excessive I mean not more than one per post. Yes, they convey your emotional state of mind pretty well, but they really look silly. Posts like “Hey! Guess what I bought today? 😀 An iPad 2 😀 😛 ;)” look real stupid.