LinkedIn - LinkedIn is a business-oriented social networking service, mainly used for professional networking.
Ripple - Ripple connects banks, payment providers, digital asset exchanges and corporates via RippleNet to provide one frictionless experience to send money globally
about.me - About.me lets you quickly build simple and visually elegant splash pages that points visitors to your content from around the web. Get started today.
Cooper - A private professional network for quality intros
Xing - World-wide social network service aimed at business professionals.
Polywork - Polywork is a professional social network that allows you to post updates about what you're up to (in work, and, if you like, in life too).