E-mail messages that offer a social-sharing option generate a 30% higher click-through rate than e-mails without any sharing options, according to a new study released this week and featured on BtoB Online. If the e-mail includes three or more social-sharing options, the click-through rate jumps to 55%, according to the study.

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The “Email Marketing and Social Media Integration Report,” which examined about 500 million e-mail messages sent by 19,149 customers in March, April and May, Twitter was the most popular social-sharing option, included in 67.2% of all social e-mails, with Facebook a close second at 62.7%.

E-mails shared on Twitter returned click-through rates of 10.2%, more than 40% higher than messages not linked to any social media, the study reported.