"...the social web is your new distribution channel as well as your portfolio for intellectual assets. Whether you’re in the business of creating, marketing, selling, or distributing media, the social Web is an incredible medium that can create a brand, establish visibility, and build demand, all without active promotion. It’s about letting your expertise or work market itself through the practice of a socialized form of inbound marketing that helps make content discoverable when people search." Says Brian Solis (see link at bottom)
It is all about trust..."who you gonna call?"

Read the entire blog by Brian Soilis here
http://www.briansolis.com/2010/02/social-media-optimization-smo-is-the-new-seo-part-1/