Digg and Twitter style Follow and Unfollow Application using Ajax, Jquery and PHP

This tutorial teaches you how a create Digg and Twitter styles of Follow and Unfollow items with the help of Ajax, Jquery and PHP.
Currently, i have used the ID of an item along with the IP Addresses of users to check if a specified user is following an item or not. You may create a session and use that in place of the IP Address of a user if you wish.
The tutorial gives you the basics of how to implement this kind of applications. 
To install the system on your server, simply open the file named README.txt and follow the steps given.
The script is written in a way that any one can easily understand and customize.

Click here to view this tutorial