Facebook rules
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The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook to allow any web page to have the same functionality as any other object on Facebook. While many different technologies and schemas exist and could be combined together, there isn't a single technology which provides enough information to richly represent any web page within the social graph. The Open Graph protocol builds on these existing technologies and gives developers one thing to implement.
The Open Graph Protocol
At Facebook, we believe that ads should contribute to and be consistent with the overall user experience. The best ads are those that are tailored to individuals based on how they and their friends interact and affiliate with the brands, artists, and businesses they care about. These guidelines are not intended to serve as legal advice and adherence to these guidelines does not necessarily constitute legal compliance. Advertisers are responsible for ensuring that their ads comply with all applicable laws, statutes, and regulations. D.
Advertising Guidelines (1)
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. You must not use Facebook features or functionality as a promotion’s registration or entry mechanism. For example, the act of liking a Page or checking in to a Place cannot automatically register or enter a promotion participant.
Promotions Guidelines (1)
B. Any user may create a Page to express support for or interest in a brand, entity (place or organization), or public figure, provided that it is not likely to be confused with an official Page or violate someone's rights. C. Content posted to a Page is public and viewable by everyone who can see the Page. D. You are required to restrict access to Pages (through our gating functionality) as necessary to comply with applicable laws and Facebook policies, including our Advertising Guidelines and Community Standards .