Constant Contact announced new features today that enable email marketers to promote social sharing of their content and messaging.

The new features work with the company's existing social share functions (which have been used to share more than 40,000 unique emails this month alone). While Contstant Contact may not be the first ESP (email service provider) to realize the potential of social sharing, they are now making it even more prominent and accessible to their users

New features include Share Buttons, the Facebook "Like" Button, a Tweet Button, and a Share this Email /Survey/Event.

These sharing features make it possible for users to gain a network effect, generate more buzz, and increase exposure to broaden the reach of customer campaigns, increasing their ROI, and proving that email marketing and social media is a highly effective combo.