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Diigo is the best of the lot in my opinion! Not only are you bookmarking, you're creating a community of people interested in the same subject. Text on a site can be highlighted, annotated and discussed using Diigo. It's a perfect way for students to discuss a site's content and for them to share their web with you. Here is the link for creating a free Diigo user account: https://secure.diigo.com/sign-up