There is no valid way to compare SEO and Social Media. Both are different marketing tools and in a few ways complement each other.
Below are some points on both.

SEO
Social Media

SEO is focused on getting potential customers to visit your website through search engines and in the process from other sites.
Social Media marketing is more focused [...]

The iPhone in 2007, Android in 2009 and the iPad last year has led to rapid growth in the mobile market. Everyday these devices are bringing new visitors to your website and this trend will continue to grow. But …
Is your website ready for these visitors?

The New Constraints
When you design a website you face a [...]