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LinkedIn is an international community for businesses and professionals with features fine-tuned to help you use resources and share ideas with other professionals world-wide.

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Jigsaw is a wikipedia-like database of business contacts where your access to records depends on your contributions to the community.

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XING is a network of professional contacts to search for jobs and companies, share ideas, and find professionals in any area of expertise.

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Spoke provides tools and information to help you organize and connect with business people worldwide.

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An online networking roulette service that gives you freedom choose which conversations and people to get involved with to create business opportunities.

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Ryze offers both a general business network and niche networks by industry, interest, or place that allows users to connect with friends, find jobs, or help develop a business.

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A social network where professionals and consumers can create personal sites.

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Fast Pitch aims to create symbiotic business relations between business management and professionals world-wide.

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A social network for professionals and businesses to communicate and manage their network.

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Ziggs is a directory and people search for professionals.