I’m a big fan of Garrison Keillor and his radio show “Prairie Home Companion.” What is it that makes his listeners so loyal? Ask any of his 19,370 fans on Facebook and I bet they will agree it’s his mastery of story telling.

Some of the smartest ad campaigns have learned this lesson well. What dad can’t relate to Subaru’s “Baby Driver,” a story about the moment their “baby” drives the first time. Another favorite is an ad where Mark asks his girlfriend for a second chance using Google Chrome. Talk about viral marketing, this ad has gotten over 408,000 hits on YouTube since it first ran on TV. (if you haven’t seen it take a look...