How to map location of tweets using a specific hashtag

The Peer Review Watch team and I recently put on a debate on the subject of science publishing. The debate was entitled Peer review is broken. How do we fix it? and was a great success.

Not only was there a full panel of knowledgeable people from science and science publishing, there was also a full audience and participation online through our livestream and our hashtag for the event, #prwdebate.