Important Facebook resources you need to keep up with changes and maintain terms of service compliance.
News Feed Publisher Guidelines – you need to follow these guidelines when publishing to Facebook
Pages Guidelines – these are important for the management of your Facebook Page, especially in regards to giveaways (called “Promotions” here)
Facebook Branded Content Policy – if you work with sponsors or are a sponsor, you must comply with this policy. Check it often as updates are not always widely publicized anywhere else.