What term describes a Web 2.0 implementation that adds machine-readable metadata to contextualize web data?

The term that describes a Web 2.0 implementation adding machine-readable metadata to contextualize web data is the Semantic Web. This concept refers to an extension of the World Wide Web that aims to make internet data machine-readable to enhance the sharing and reuse of data across applications, enterprises, and communities. By incorporating semantic markup, web content can be better understood by machines, improving data connectivity and interoperability.

In contrast, social bookmarking, social media, and social commerce focus on different aspects of online interaction and content sharing. Social bookmarking allows users to save and share links, while social media encompasses platforms for social interaction and content creation. Social commerce specifically relates to using social media platforms to facilitate online shopping and buying experiences. Each of these concepts, while significant in their own right, does not involve the specific implementation of machine-readable metadata as described in the context of the Semantic Web. Thus, the Semantic Web is the most appropriate term for this concept, highlighting its unique functionality in organizing and contextualizing web data through metadata.