Web annotation

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A Web annotation is an online annotation associated with a web resource, typically a web page. With a Web annotation system, a user can add, modify or remove information from a Web resource without modifying the resource itself. The annotations can be thought of as a layer on top of the existing resource, and this annotation layer is usually visible to other users who share the same annotation system, making it a type of social software tool.

Web annotation can be used:

  • to rate a Web resource, such as by its usefulness, user-friendliness, suitability for viewing by minors.
  • to improve or adapt its contents by adding/removing material, something like a wiki.
  • as a collaborative tool, e.g. to discuss the contents of a certain resource.
  • as a medium of artistic or social criticism, by allowing Web users to reinterpret, enrich or protest against institution or ideas that appear on the Web.

Web annotation systems are typically implemented as part of standard web browsers. Those currently in release and under development include:

  • Annotea
  • Diigo for highlighting text & posting sticky notes on webpages
  • SharedCopy AJAX based web annotation with cache and shorten url with easy sharing functions. (no plug-in required, using bookmarklet)
  • Fleck Use Fleck to add stick-it notes to webpages and share these with other people. Firefox Add-on
  • Marginalia Adds text highlighting and margin note capabilities to web applications. Open sourced and JavaScript-based; works with Firefox and Internet Explorer (no plug-in required).
  • Stickis with toolbars for Firefox and IE.
  • Wikalong for Firefox
  • HyLighter Adds comments, highlighting, embedded questions, tasks and links to documents and images. Color-codes enable readers to compare their annotations to those of others: yellow = mine, blue = theirs, green = ours. These social annotations deepen understanding of text and images, promote higher-level metacognitive thinking, and facilitate revision of documents.

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