I hope to not seem stupid 
I have installed prosper in one of my hosting and I'm doing any test.
But i dont understand it right....
For example i'm running a FB campaign and I'm sending the traffic to 2 landing pages,
what is the difference about post in the landing page the prosper link or affiliate link?
Please help me for remove this confusion from my head 
In your scenario prosper202 should help you understand which LP has the better CTR and Conversion rate, for example.
Without a tracker you had to do some math manually to get to the same conclusion