Facebook's Contest Rules

I am seeing a lot of contests from both individual authors and publishers that seem to break Facebook's contest rules.  I guess you will get away with it most of the time, but losing your Facebook page could be a major pain in the ass.  So be aware:

If you use Facebook to communicate about or administer a promotion such as a contest you must not:

• Require "liking" of a facebook page as part of entry
• Notify winners through Facebook