I have an idea for a major improvement to delicious. When I select a specific tag in my account, all the bookmarks with that particular tag show up, and I get a separate list of all the “related tags,” ones that appear with the first one on one or more bookmarks. I have the option of clicking on the plus sign in front of any of those tags to limit the bookmarks showing to those with both tags–like a Boolean AND. It would be really helpful to have to option of clicking on a minus sign–like a Boolean NOT–that would remove bookmarks with that tag.
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