Diigo is a social bookmarking service which we covered briefly while it was in private beta. But the service is out of beta, and has launched a new set of tools that make it easy to mark up web pages, save pages to your account, and search through your bookmarks and those of other users.
Twitter is a Web 2.0 utility that asks the question "What are you up to?" It's a microblogging platform that allows users to share small tidbits about their current activities, locations, plans, and more. I can send out a Twitter update using my cell phone or my blog or by logging into the Twitter Web site.
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