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For longer articles or for posts where I want to highlight a particular quote or passage, I also use Diigo, which I've written about before. I can use it to bookmark pages, but I'm mostly interested in my ability to use a virtual yellow highlighter directly online and to add digital yellow sticky notes, too. So when I go back to the page, it's like the page in a book with my highlights (other people may have highlights, too), my comments and so on. It's really very cool and helps me to pull my thoughts together.