social annotation tools

Diigo: Diigo is a social annotation tool. It is in the same category with the “older” Delicious ( But also in competition with a tool we know now well: Evernote. In 2014, it was predicted (as with Evernote) that other tools, such as SlideVibe: cloud-based SideVibe elbows the market of Evernote and Diigo may take…

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