I just received an email from a maillist to which I have subscribed for many years.
The question posed by the sender (a teacher) was…

So what can I actually use a classroom blog for?

Instead of asking for emails, they have set up a Wiki [definition] for people to build up (visit it here).  I’d suggest that if you’re interested in answering the original question you get in there and contribute.

It’s a very different experience and one that more and more children are getting familiar with. Also, if you’re into knowledge building communities [definition] this will put some ideas in your head!

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JB