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Diigo, web highlighter, sticky notes, online bookmarking tool, is a social bookmarking site with more than nine (9) million + users in 2016. Diigo allows users to bookmark, tag (with "sticky notes") and highlight web-pages. The basic service can be used for free, and includes an optional bookmarklet and customizable toolbar. "Diigo" is an acronym of "Digest of Internet Information, Groups and Other stuff". The service allows users to highlight parts of webpages with sticky notes. Annotations can be completely private or shared with groups. Premium account holders can search cached copies of bookmarks, tags and annotations. They can omit tags that appear in the text of a page (although text inside images cannot be searched). Highlight is enabled by a menu that can appear when content is selected or be embedded into the menu.
Though Diigo provides social networking features, it is different from typical social networks in that it is focussed on social networking through knowledge-sharing. As a social information network, Diigo aims to improve information consumption, research, and sharing where connections between people and information is harnessed. The key is to improve knowledge sharing and content discovery, and to enable more meaningful social connections and intellectual exchanges. Social media users come to Diigo not to socialize, but because it provides superior tools for collecting, annotating, organizing and discovering information. The "social" aspect of Diigo manifests in several ways. Some users will find that connecting with friends is a great way to learn from friends. Some users find that it is a great way to find people with expertise or engage with those who share similar interests.
Mobile apps for Diigo are available for iOS, Android and Windows Phone 7.