Bit.ly is famous because it can short the url and it can monitor and count the url click statistic. Because of those functions, twiterres can analyze their followers by using bit.ly. Bit.ly with redirecting system can be used to analyze followers interesting by trying some tweets with steps below :
1. Try many categories of tweet, sometimes tweet the business category, sometimes about blogging, products, etc. Don't forget to short a business url, blogging url, etc.
2. Tweet those urls and check the urls info in bit.ly.
3. Which one the most tweet clicked, that is the favourite category in your followers.
This analytics help you to make a niche blog or website that is very useful for your followers. And I think you will get visitors from your followers.
