Dunkin Donuts is offering a free medium beverage when you sign up for Dunkin Donuts Perks. If you are already a Dunkin Donuts Perks member, update your profile to get a free drink for your birthday. Also, if you are a American Express Blue, Blue Cash or Blue Sky card holder, you can register your card here. If you use your card at Dunkin Donuts 4 times in a calendar month, you’ll get a bonus $5 Dunkin Donuts gift card. Offer valid through 3/31/11.
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