Reid Hoffman — American Businessman born on August 05, 1967,

Reid Garrett Hoffman is an American internet entrepreneur, venture capitalist and author. Hoffman is the co-founder and executive chairman of LinkedIn, a business-oriented social network used primarily for professional networking. Hoffman, with a net worth of US$4.7 billion, is ranked as #341 on the list of the world's richest people... (wikipedia)

One of the challenges in networking is everybody thinks it's making cold calls to strangers. Actually, it's the people who already have strong trust relationships with you, who know you're dedicated, smart, a team player, who can help you.
My belief and goal is that every professional in the world should be on a service liked LinkedIn.
Social networks do best when they tap into one of the seven deadly sins. Facebook is ego. Zynga is sloth. LinkedIn is greed.
Everything in life has some risk, and what you have to actually learn to do is how to navigate it.
Silicon Valley is a mindset, not a location.