If you want to win friends and influence people, social-networking Web sites such as Friendster, Ryze, and LinkedIn can help you do it at Internet speed. These sites typically allow users to create online profiles, then build "personal networks" by linking to the profiles of friends or associates. Their friends and their friends' friends then become potential collaborators, employers, or dates. It's one of the hottest crazes on the Web, supplementing e-mail, blogs, and personal ads as a way to make connections.

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