social annotation tools

Diigo: Diigo is a social annotation tool. It is in the same category with the “older” Delicious (https://del.icio.us/) 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…