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The following was originally published November 5, 2010 at http://hnzzholly.wordpress.com/2010/11/05/t-a-p-e-i-know-more-about-bookmarking/ Social bookmarking serves in different purposes. Though Dr. Krug has told us what they are ，I still spent a lot of time to make sure what they are.Bookmarks can help us remember some specifics which we have found useful, such like some news , articles and so on.I am still learning to use it .During my trying , unluckily I was told Del.icio.us coundn’t be allowed to access. So I chose Digg to try how a bookmark tool is used in different ways.