Twitter is considering extending the maximum length of tweets to 10,000 characters, sources say. The extended tweets would have a similar appearance to traditional tweets, but they would include a call to action that invites users to view content beyond the familiar 140 characters. It will interesting to see if this makes Twitter a better tool for education. Over the years educators have bemoaned the fact that kids sometimes falsely believe that 140 characters covers all that needs to said on any topic.