Free Twitter Analize Tool
Followerwonk is a very great tool with many usefull options
You can search for twitter bios profiles.
Your can compare your social graph to competitors, industry leaders, friends, etc.
Slice any Twitter user’s followers or friends into segments. Find most dormant, influential, olders, and more info.
Statistics about who has followed and unfollowed you every day.
Track every change to your social graph, and present interactive graphs to allow you to drill-down and list specific followers lost and gained for any time period.
And you too can save your reports
Take a look and after shared your opinion.
Free Twitter Tool statistics and more options.