Marketers are beginning to tap into the popular social networking site Twitter to provide exclusive access to offers and promotions. Online coupons are not new or unique, but they’re perfect promotions. For online Twitter users, it’s 1.) see the tweet, 2.) print and 3.) present the coupon to get the deal. The only issue is people who access Twitter on a mobile handset. These Twitter users can’t print coupons, so will businesses honor them? Read the full article about Twitter coupons.