1) Social bookmarking is a medium for web users to save, organize, find, and share websites, information and just about anything else they want to keep track of on the web.

2) I would say almost everyone that uses the internet is using some form of social bookmarking in some way or another.

3) Every site is a little different, the basics all seem to be the same, a website that allows you to find, share, save, and organize things you find interesting or useful on the web.

4) This is significant because its an ever improving, very efficient way of promoting, sharing, and saving/organizing information and resources found on the web.

5) Social bookmarking looks as if its future is to be used by companies to share resources with employees, used to promote blogs web pages and anything else such as ideas and views.

6) Teachers can easily share information and resources with other teachers and thier students. Students could easily share the same with each other, which could be very useful during a group project for a class.

7) Some downsides include no standard keywords, also tags could be harder to find because of human errors such as spelling.

8) Some benefits would be that it is very much easier and faster to save resources, and it could make it easier to find tags that are not yet indexed by search engines, because the tag classification is done by people who undestand it, not a search engine using an algorithim to sort things out.

9) Between Delicious, Stumble Upon, and Digg, I was most impressed with Digg, as it seems to be more geared to help internet marketers promote whatever it is they may be trying to promote. Since I am involved in this field, I was happy with what I saw, as I found countless reviews as to how Digg has been known to help so much traffic to your site that it frequently crashes servers because of such high traffic volume.