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"Diigo is a social bookmark service. A social bookmark service is like the Favorites in Internet Explorer, or Bookmarks in other web browsers, like Firefox. However, instead of saving a URL to your computer, you save it on the internet. This has a number of advantages: ..."

"If someone follows you in Twitter, the polite thing to do is reciprocate, right? Well, maybe so, but I think it needs a little more thought than that. Here is a list of the steps I take when someone follows me. Incidentally, the same techniques, with a bit of adjustment, work for any social network situation where people can become your "friend""

Tons of Web 2.0 tools to use in your classroom

"Back channeling is the practice of using networked computers to maintain a real-time online conversation alongside live spoken remarks. This is such a useful way to collaborate with educators and students when introducing new ideas, presenting in front of a large crowd, or even when watching a video."

"One of the goals of Prof. Hacker is to introduce to you some of the tools we use so that the tools become less intimidating. Face it, changing one's preferred word processing program can be pretty intimidating-not only for you but for students as well. In this post, you'll get a quick introduction to Google Docs as well as some "lessons learned" by yours truly. In the comments, I hope others will share their experiences using Google Docs in the classroom."