Ninja Popups combines a professionally designed popups to convert visitors on your site/blog into taking an action whether its subscribing into your newsletter, offering a discount/coupon for leaving customers, or locking content until they share you will increase your subscriber count and social signal of your site/blog.
Demo: http://bit.ly/1MSabvY
http://bit.ly/1Og29A4
http://bit.ly/1Og27IC
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http://bit.ly/1Og29A6
http://bit.ly/1WZTjhr
http://bit.ly/1Og27ID
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http://bit.ly/1Og29A7
http://bit.ly/1WZTidl
http://bit.ly/1Og29Aa