This is a very cool animated map from Andres Johanson
The map shows Twitter traffic in London during a 24 hour period.
The red circle indicates tweets with re-tweets marked as yellow points moving in the direction of information, i.e. from the original tweets towards the location of the re-tweets.
- See more at: http://www.tweeterstreet.com/blog.html#sthash.9LNDRY3s.dpuf