Minor League Baseball has taken a major step forward in using social media as a fan engagement platform.MiLB in April hired its first-ever social media marketing coordinator and in May partnered with Greenfly, a technology company that allows the league to request and share club-specific social media content.The league is using Greenfly to support “It’s Fun to Be a Fan,” a 10-year marketing plan launched before the 2017 season. The goal of the campaign is to draw 50 million att...