If your market is that 18-24 (and really 15-18 and 24-35, if we think about it), that changes the calculus on whether or not to try location-based promotions, a mobile version of your site, or even a mobile app.

Gap Promo Shows Location Deals Need Work

This doesn’t mean you shouldn’t experiment with location-based offers, but that there are a few considerations.

1. Do you have reason to suspect that a quorum of your customers/potential customers use Foursquare/Places/etc.? Managing and maintaining an active social media presence and/or mailing list will let you ask this question directly.
2. Does your offer explain itself well enough for people to take advantage of it? Are you trying to generate interest among early adopters or just get more people in your door?
3. What is your plan for managing customer reactions when they don’t understand the offer correctly? If your goal was to generate foot traffic, and a customer has come in without officially “checking in”, does it really matter?

And the list goes on beyond that, of course, but without answering those basic questions, perhaps another campaign would be a better choice for generating foot traffic.

PS: To be fair, the promotion was still a success for Gap, and a great first trial for Facebook Places deals, as this quick summary on FastCompany shows.