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But I have discovered another use for Diigo: annotating websites on the iPad. As far as I know, Diigo offers the only means to highlight passages and add annotations to websites from within the iPad's native Safari browser. Diigo does this through the Web Highlighter bookmarklet, which opens up a toolbar that looks like this:

Welcome to Twitter! There's a lot of confusing terms. What does the abbreviation Twitter RT mean? How do you reply to someone on Twitter? What are the definitions of all this slang stuff? Here's the answers to your Twitter questions.