Marketing, promotions, or other contests
Any promotion, marketing, contests, or other giveaways should clearly link to the terms of the activity and provide clear guidelines and qualifications. All such promises, given or implied, should be adhered to.
This is an odd Guideline in a number of respects. At this point there is no obvious way to run contents or giveaways on Places and even if you figured out a way to do so (via Offers or Updates) it is not clear that you would be able to include a link. I have asked Google for clarification as to what exactly this new guideline applies to.