Web 2.0 Websites typically include some of the following features/techniques:

• Search: the ease of finding information through keyword searching.

• Links: guides to important pieces of information. The best pages are the most frequently linked to.

• Authoring: the ability to create constantly updating content that is co-created by users. In wikis, the content is iterative in the sense that the people undo and redo each other’s work. In blogs, it is cumulative in that posts and comments of individuals are accumulated over time.

• Tags: categorization of content by creating tags that are simple, one-word descriptions to facilitate searching and avoid having to fit into rigid, pre-made categories.

• Extensions: automation of pattern matching for customization by using algorithms (i.e. Amazon.com recommendations).

• Signals: the use of RSS (Real Simple Syndication) technology to create a subscription model which notifies users of any content changes.