Twitter more likely to induce advocacy and future purchases .

Marketers looking to push out the most effective messages to opt-in recipients must understand how audiences differ across channels and what causes them to connect with brands. Marketing venues that seem similar may differ strongly if their users have different needs and motivations.

According to the final edition of ExactTarget’s “Subscribers, Fans and Followers” report, the differences between email, Facebook and Twitter also include their influence on customer loyalty.

Daily Twitter users who followed a brand were more than twice as likely as daily Facebook users who “liked” a brand to say they were more likely to purchase from the brand after becoming a social media follower.

The pattern among Twitter followers, email subscribers and Facebook fans was similar when asked about whether they would recommend a brand. A third of Twitter followers said they were more apt to make a recommendation now that they followed a brand, compared with 24% of email subscribers and 21% of Facebook fans.