Individual data question

Im not sure how else to word this….but here goes…

I need to integrate a user area in which i can post data for an individual user.

Example my site will serve as an insitive ad revenue program, in which regisered users click on an ad, complete what is needed, and that information is then sent to my advertiser.

When i get notice of there completion from my affiliates, i want to be able to notify them on wordpress. Like a static page for their completed referals. (example you have completed…so and so)

Is there a way to do this in wordpress? If not can someone point me to another type of cms mabey? Iv been looking for information all day thanks.