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Here is what it says on facebook

Facebook does not knowingly collect or solicit personal information from anyone under the age of 13 or knowingly allow such persons to register. If you are under 13, please do not attempt to register for Facebook or send any information about yourself to us, including your name, address, telephone number or email address. No one under the age of 13 may provide any personal information to or on Facebook. In the event that we learn that we have collected personal information from a child under the age of 13 without verification of parental consent, we will delete that information as quickly as possible. If you believe that we might have any information from or about a child under the age of 13, please contact us through the form on our privacy help page.