Identify three mechanism aids for Web 2.0 tools

What will be an ideal response?

Tags, folksonomy, and social bookmarks are three mechanism aids for Web 2.0 tools. Tags are nonhierarchical keywords or terms assigned to a piece of information. Folksonomy is the practice and method of collaboratively creating, classifying, and managing tags to annotate and categorize content. Social bookmarking is a Web service for sharing Internet bookmarks.