For Giveaway Hosts & Sponsors

I recently learned about this and I thought I'd share it with my fellow giveaway participants:

What are the guidelines for running a promotion or contest on my Facebook Page?

For a complete list of official policies, please read our Promotion Guidelines. Here is a summary of the most common guidelines that promotions violate:

• All promotions must be managed through a third-party app.
• You must not use Facebook features or functionality (likes, comments, videos, photos, cover photos, etc.) 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. Similarly, requiring someone to share a post or photo in order to enter a promotion is not allowed.
• Facebook features and functionality, such as the Like button, can't be used as a voting mechanism in a promotion.