What is LinkedIn? LinkedIn is the social networking site for professionals looking to connect with other professionals. LinkedIn defines itself this way, "LinkedIn is the world’s largest professional network with over 120 million members and growing rapidly. LinkedIn connects you to your trusted contacts and helps you exchange knowledge, ideas, and opportunities with a broader network of professionals."
LinkedIn prefers these professionals connect with people they know and trust. Many of us find that keeping an open mind and connecting with professionals we haven't met, but would like to connect with is of benefit too. Count me among those. Because we share and exchange information, as well as contacts, I prefer not to limit myself to those I have met in person. To me that seems very restrictive.