Location is fundamental to the Groupon experience, you can’t use coupons for (most) local businesses without being proximate to them. So it’s obvious that they should tap into the location aware phones that gobs of people carry with them everywhere and piggyback on location-based services that people are already using like Foursquare and Facebook Places.

Although Foursquare hasn’t officially announced a partnership with Groupon, everyone is talking about it and founder Dennis Crowley’s cagey responses seem to indicate something is in the works.

So why the Whirrl acquisition? Is Groupon going to simultaneously enter the check-in / loyalty space and work within existing apps? Sounds like a tall order but ambition is certainly not something the young powerhouse lacks.

Watch Dennis Crowley’s “Fireside Chat” with Mike Arrington at TechCrunch Disrupt below.

Cute ad for Breakstone’s sour cream.

BBH, NYC

If you think the objectification of women in the commercial is bad, I dare you to click through to the YouTube comments. Actually, don’t do that.

I like everything about this ad except the talent. Is that guy singing poorly on purpose? I’m going to blame American Idol.

Clickz has a quick case study on Chipotle’s cross-promo with NBC’s new food show, America’s Next Great Restaurant. As part of a burrito giveaway they encouraged people but did not require them to “like” their Facebook page and picked up 300,000 new likes in a little more than a week.

Clever idea, nice execution. via Ads of the World

This is really too bad, Harley Davidson deserves better.

In these Model vs. Model ads at least the hot girls are there for a reason. Right?

Real Kiwi Men Eat Yogurt