http://teachingall.blogspot.com/2008/07/microblogging.html
http://www.edweek.org/dd/articles/2008/06/24/01twitter_web.h02.html
With Microblogging, you are able to view or write about simple things you may be doing at that particular moment. It's a shorter, quicker version of Blogging. Microblogging would be a great technological tool for ELA teachers in the mid-elementary to middle school years. Microblogging would allow students to write simple sentences about the events going on in their lives throughout a day.
As with many online communication devices, the notion of privacy weighs heavily in importance. We are, after all, talking about children and their safety and privacy from online predators come first. Teacher-controlled accounts can exist, but the teacher must be dedicated to always staying on top of the privacy issue.