95% of our new Public Relations, Analyst Relations and outsourced Marcom clients today are direct referrals from people I know and who I have worked with in the past.  We do use Linkedin as our main marketing tool to create and maintain our brand in the marketplace–but in the end of the day–most of my new clients have come to me because someone has given me a personal referral…So keep on learning about and using social networks–but dont forget real relationship building.