I also like the "save for later" feature as well so you can read off-line if you don't have a connection.They also have a feature to send bookmark information directly to one's blog, but I cannot seem to get this feature to work for me. I am still playing with the ins and outs of Diigo. Sometimes I cannot get it to do exactly what I want but I think that is because I am using Safari for my browser. You get more features with Goggle Chrome.
If you have not already signed up, you can do it here. Request an educator account by following this link here which will allow you to do even more things with things that interest you on the web.
Click here to follow my Diigo library. It is still a work on progress, but as you can see it is quite easy to share articles you think others might find interesting or useful.