What: Tweet Reach is a measurement tool for Twitter that analyzes the reach and exposure of an idea in a tweet. Using a specific URL, phrase, or hashtag, Tweet Reach "examines the people who have had it in their tweets, looks at how many followers they have, and does a calculation of reach based on that," explains David Erickson, director of e-strategy for Tunheim Partners, which uses the site for some clients.
How: Tweet Reach has a free version, which ...