I read about Twine in a post on Read/Write Web. It looks very interesting. According to the About page, "Twine is a new service that intelligently helps you share, organize and find information with people you trust." In addition, "Twine uses the Semantic Web, natural language processing, and machine learning to make your information and relationships smarter."
I've requested an invitation to try it in beta, but I haven't heard back yet.
