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Warichu is an impressive social annotation tool that works on top of the web, which offers a platform for people to discuss web content. It's analogous to how ants navigate their terrain, where they uncover valuable resources, remember them, and share with others. People, similarly, communicate through Warichu's layer to collaboratively discuss information. Essentially, this layer overlays the web and supplements it with features to facilitate communication.

Warichu's main feature is the ability to create virtual sticky notes that users can attach to web pages. The notes persist even after users leave the page, and shared notes appear on the page for all parties involved. Warichu also offers various types of sticky notes, each with unique functions that cater to different needs. For example, some can be shared with others, while others are stored locally on users' computers. Others allow users to modify the web page they're stuck to, while others align snippets of text from that page. Additionally, Warichu provides an API that allows developers to create their types of sticky notes.

To access all of Warichu's features, users only need a Firefox browser version of 1.5 or later. Overall, Warichu is an excellent tool for web annotation that's easy to use and has several versatile features fit for any user's needs.