1. first download firesheep from here - http://codebutler.github.com/firesheep/ [install it in your firefox browser]
2. Once installed it will open a sidebar window into your firefox browser.
3. Now it will show all the people who are connected to unsecured wifi network. Once they login into your facebook or twitter account you will get a notification and with a single click you can login into their account. This whole thing work on the technique of cookie hijacking.Once
your session cookie is hacked then anybody can login into your account.These cookies can be easily caputered on unsecured wifi network.
How to protect
The best way to protect yourself from such a Stealing trick is to avoid
using your facebook or twitter accounts on unsecured wifi networks as it
is a security lapse from the websites not on your side.
you can enable safe browsing in facebook just go to account settings!
Term and Condition: Read Only for Educational Purpose