This is a WordPress plugin that allows you to let your users subscribe your MyMail lists via social networks and without any worries about filling the form field to subscribe. You can make a lot of things, such as show confirmation window or don’t, you can send confirmation messages to confirm the user email or not and much more! Your public can subscribe your newsletter via Facebook, Hotmail, Google, LinkedIn, VK and by just typing the email.
Demo: http://codecanyon.net/item/mymail-social-wordpress/12832712