Would You Recommend Joining Facebook?

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Alright, I ask this question because my friends keep asking me to join Facebook. I'm afraid that if I do join, someone is going to get all my info. Also, there are some mean girls on FB from my school and I'm worried about them trying to friend me on FB because if I don't accept their request they will probably harass me about not being friends with them on FB. Should any of this concern me? What is it that makes Facebook fun (because my friends are all like, "C'mon join Facebook. It's so fun...")? What all do you do on there? What are its main points? If anyone knows, please answer. Thanks in advance!