Diigo, which stands for "Digest of Internet Information, Groups and Other stuff," brands itself as a multi-tool for personal information management. First appearing in 2005 as an online bookmarking site, Diigo soon branched out into web annotation, including highlighting and sticky notes. Manually enter or use Diigo's browser extension to save links, pages, notes, and pictures. With a free account, bookmarks and notes are unlimited. Three additional plans provide increased functionality and an education account (free for teachers and students) enables Diigo to be used in collaborative class assignments. Twenty percent of Diigo's user base are students and teachers who use the tool to highlight, add notes, and share websites. Librarians working on a project could benefit from Diigo's annotation, cloud storage, and sharing capabilities.
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