Social+Bookmarking

Creating a new site //Delicious,// where we can post great websites that all can get to whereever we are. Please post a site, the reason for it and what grade level(s)subjects it would apply to: Example:::: [|www.gaggle.net] ~this is a site where students can have their own email that is monitored by the teacher and has an excellent filtering service to protect the students. It applies to secondary and all curriculums.