How do I create a social networking site where people can gain points for logging on?

i am looking to build a social networking site similar to myspace but i want there to be a point system, where they can gain points upon loggin in and more points for interacting with other users. i will be using a CMS... any help will be greatly appreciated. Thank you

How do I create a social networking site where people can gain points for logging on?
I believe Joomla has a points / dollars system as a mod.





http://www.joomla.org