09 Feb Check in at Walgreens and Receive Tweet Deal Coupons [VIDEO] Posted on February 2, 2012 in Other by Jennifer Yim ShareIf your product or service is purchased in a physical location, there are interesting things you can do to combine mobile and social. Check out this example, where Walgreens rewards check-ins with a coupon and think about how you could do something similar for your business.Tags: #coupons #engagement #mobile