How to check ID of user
 

Im writing on a function where people can add a link once every 24 hours.

Im setting a cookie that last for 24 hours, use sessions, store IP, email and URL in database.

What more can I do?
What if people use proxys, change email, delete cookies and restart their browsers? anything to do about that? |mml|

Have them register and create a unique username/password, store that in your db along with the rest, and make them login. :D

Yeah, I figured that out as well... But what if they make a new account? Were dealing with webmasters, and they might want to get more accounts to get a bigger piece of the cake... |cry|

A list of known proxy's can be googled.. Block those IP's by default...

Forget about those dial-up webmasters.. Also block all known dialup IP's.

Use a new approval procedure, where webmasters need to fax a copy of their ID before a link is added..

MD5 Hash the user's screen resolution, color depth, browser plugins, user agent and ISP's name and use that as lead indicator for multiple submissions.

Or just relaxed and monitor your database now and than.. :D

Yep, that might be the right way... |mml|