Visual.ly makes it easy to make your own Infographics from Twitter hashtags. To create an infographic with Visual.ly just sign-in with your Twitter ID, enter a hashtag that you want to see visualized, and select an infographic template. I created a simple infographic using the hashtag #edchat.
Applications for Education
Right now Visual.ly has limited application beyond visualizing hashtags, but hopefully they'll add more functionality in the future. In the meantime, Visual.ly could be a good way to visualize trends in current events for a social studies classroom. If your school uses Twitter to broadcast messages, like Patrick Larkin's school does, Visual.ly could be useful too.