Diigo has been about for some time, but I have only just registered an account. I use Digg, Delicious, Stumbleupon and the other bookmarking and surfing web applications/social networks that I have posted about in recent weeks, yet diigo adds another element to my web adventures.
Diigo is a social network sharing site, in that you can share the bookmarks/favorites that you save. But the new element that diigo gives me in my surfing the net is that which I have at hand when I am reading a book or magazine offline – a highlighter and the ability to add notes to the written page (which in diigo is done via a sticky note that is attached to the page you are on). I can then return to the page I am reading with a bookmark as it were attached to where I got up to (by way of a sticky note), highlighted sections that were of particular interest to me and the ability to share what I have added to that page by way of my highlights and sticky notes. It is also possible to take a collaborative approach to this sort of online research by creating a group of users within diigo.
I can see diigo becoming a very important research tool that I will use for many years to come.
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