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an excellent explanation with visuals and text of how Twitter works.

Presentation: Twitter in the classroom

Embedit.In (part of Box.net) is a nifty online tool to convert most file formats to embeddable code for wikis, websites, blogs and more. Once embedded, you can write on them with an onscreen pen or highlight. When you upload the document and push 'embed', it provides a code to be copied and shows what the file will look like when it's embedded. I have 5th graders use it to embed their projects into their wiki pages. I teach them how to save MS Office files to pdfs (through the 'save as' button) and then convert the file to an embeddable format for their digital portfolios. Here's all you do: Log in using your Google, Twitter, Open ID, Yahoo, WordPress or AOL identity. I like that. One less log-in to remember. Upload the file Wait a moment while it processes and copy the embed code to the clipboard Paste the html code into the widget or embed code (or the html format for blogs) button and save.

"Take a picture or make a short video of what you see on your computer monitor. Picture/Video Share it instantly via web, email, IM, Twitter or your blog. Picture/Video Simple and free, Jing is the perfect way to enhance your fast-paced online conversations."

Transform your doc, pdf, word, movie in an interactive flipbook. It's very easy: upload your file and you will receive an email with the url to your creation. You can share this with your friend, family... by email, on your blog, on facebook or twitter

"How Many Really? compares the number of people involved in key historical events or situations to the people you know through Facebook or Twitter. You can also add your own numbers - for example, the amount of students in your class."