More than half of email marketers are integrating email with social media, according to metrics from Marketing Sherpa. The study also found that more than 75 percent of marketers consider email and social media to be the most effective customer engagement tools. Marketers have work to do when it comes to mobile. Despite the fact that every consumer seems to be checking email on their phones these days, only 21 percent of the marketers surveyed expressed an interest in integrating email with mobile marketing.