I don't use the same platform but you might get some ideas from our class blog. We do have RSS news feeds coming in--it's hard to find feed that is OK for kids. N.
I didn't make my point, I tend to expect my reader to read my mind. Let me start over---one of the options for "what can I write about?" is allowing students access appropriate news feeds coming in to your site by RSS, rather than having them search willy nilly on the Web. So I was able to find news feeds appropriate for kids--here's the feeds we use http://areallydifferentplace.org/aggregator/categories
We also link to a creative writing prompt site and have the option on the blog to write Books. Continue on....N
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Forum posts can be organized by the use of "tags." To see discussions on specific topics, click on the links below. Standardized tags you can use to have your posts included in the link results are shown in parentheses.
(To participate in the discussion on standardized tagging here at Classroom 2.0, see this post.)