These Promotion Guidelines, along with the Statement of Rights and Responsibilities, the Ad Guidelines, the Platform Policies and all other applicable Facebook policies, govern your communication about or administration of any contest, competition, sweepstakes or other similar offering (each, a promotion) using Facebook.
If you use Facebook to communicate about or administer a promotion, you are responsible for the lawful operation of that promotion, including the official rules, offer terms and eligibility requirements (e.g., age and residency restrictions), and compliance with regulations governing the promotion and all prizes offered in connection with the promotion (e.g., registration and obtaining necessary regulatory approvals). Please note that compliance with these Guidelines does not constitute the lawfulness of a promotion. Promotions are subject to many regulations and if you are not certain that your promotion complies with applicable law, please consult with an expert. Read the rest of the rules here: https://www.facebook.com/promotions_guidelines.php