Facebook steals private information and photos from you and your friends. They find out everything that you do and put on the site and even with the choice of deactivating your account, they know your name, hobbies, any information, how you talk, all your messages, all your conversations, all your photos, what you like and what you hate.
Facebook knows exactly what type of person you are.
Facebook is your identity and governments use this to track you down.
Just consider these ideas, truths or possible rumors as no one truly knows.
Scammers and hackers are crossing from MySpace to
Facebook. Now the social network once named safe is infested with all of these scammers.
Also if you have heard there was a new 'dislike button' which you could enable by clicking on a link and following the steps. Now why would
Facebook not integrate it by themselves? Because it was a SCAM

In conclusion Facebook is a dangerous site and may affect your real life if not taken with care, so you may think twice before you decide to post something on
Facebook or like something inappropriate, etc etc.