Twitter Reach Report

"Reach provides an understanding of the overall impact of your message or campaign. A high reach indicates that a broad base of different users found your message interesting and spread it to their followers. It often means that multiple unrelated people found out about your campaign from sources outside of Twitter. Conversely, a lower reach means that your message is likely only being shared among a smaller group of people who may be more interrelated (e.g. people in the same geographic area)."

http://tweetreach.com/

http://tweetreach.com/reach?q=%23walesliesfortourists