How to analysis our twitter followers?

Hello friends,

I want to know how to check all stuffs like:

1. how many members are online at what time?
2. which topic they are interesting for?
3. is there any other tool like "Followerwonk" which should be free?

If you know such kind of tool then please share.

thanks in advance

Hi,

Tweetreach.com
Listorious.com
tweet.grader.com/location

Are some free tool which may help you with your questions.

piscesmail123 Thanks really these links are working ...