This wiki is managed by Dave Chaffey of Smart Insights to help keep marketers up-to-date with developments in digital marketing

From Marketing Online

Twittercounter is well known as a basic tool showing trends in your number of followers, but how do you go beyond this to understand influence of a Twitter user and how well they engage their audience?

The more sophisticated tools for assessing changes in reach and influence in Twitter are web services which authenticate direct with Twitter. The tools are:

• Tweetlevel Tweetlevel is a new tool (Nov 2009) from PR agency Edelman which measures influence, engagement and trust as well as the number of followers. The measures are aggregated from the tools below...
• Twitalyzer An established tool which combines measurement of Influence and engagement with interpretation and outline recommendations on how to improve.
• Twinfluence A more basic tool giving a measure of Influence

Additional articles and reviews on Twitter measurement tools

• Review of Tweetlevel
• Summary from Marketing Vox of the main tools for measuring Twitter.