21 – Diigo


A social bookmarking, research, and knowledge sharing tool that lets you take personal notes and highlight text information on web pages.  Also supports sharing of bookmarks in groups.

The highest ranked social bookmarking service on the list, Diigo has dropped back out of the top 20 this year.

Website Cost Availability
www.diigo.com Free and premium versions Online
2013 2012 2011 2010 2009 2008 2007
21 18 13 15 22 35 72=

Comments from some of those who selected Diigo as one of their Top Tools

still my go-to web curation tool, 2014

great for sorting and organizing learning sites  Danny Ortegon 2013
as a productive tool to manage links and archive contents 2013
Social bookmarks are a quick way for me to save a web page and find it easily (Diigo allows me to do an auto backup to Delicious).  Harold Jarche
social bookmarking & storing all useful URLs  Sam Oakley 2013
Use it to save and bookmark weblinks, easy one click process using my Nexus 7, sync with desktop and phone.  Mark Rollins 2013
collect, share, annotate online resources  Lyra Hilliard 2013

  • “with delicious I collect and share, with diigo I recollect, select, reflect collaborate (and so on)…. If only I had the time” Herman Post
  • “lets me highlight the web and follow what people are bookmarking around topics that interest me” Debora Gallo
  • “Free. With the use of diigo and the automatic export to del.icio.us you gain a great Social Bookmarking + Social Annotation tool The best way to collect, share and interact on online information from anywhere.”  Andreas Büsing
  • “Diigo is my primary social bookmarking tool and how I generate my daily bookmark posts for my blog. I do so much online research for both the courses I develop and for my own personal learning; a good system to track all the resources I find is indispensable. Diigo’s also improved a lot since I started using it, and they’ve learned to take user feedback seriously.”  Christy Tucker