http://www.business2community.com/email-marketing/why-email-marketing-beats-social-media-in-lead-generation-and-what-you-can-do-about-it-01246702
http://www.business2community.com/email-marketing/why-email-marketing-beats-social-media-in-lead-generation-and-what-you-can-do-about-it-01246702