Walgreens is reaching Millennials with several savvy strategies that tap into their mobile habits. The drug store teamed up with Facebook to launch an app called Print Worthy, where users can print their pictures and include their friends’ comments on the photos. It also offers mobile coupons, and a feature in its app where users can create a shopping list and click a button to see all the items on their list appear on a map of the store. (eMarketer)