If you wish to create a campaign in ClixSense to track sign ups and hits to your affiliate url its very easy. If you wanted to create a campaign to track friend signups to those that you have sent you an email could do this:
Where xxxxxxx is your ClixSense account ID, for example 1234567
This will show up in your affiliate stats as friends and show hits and sign ups from it. The word after the & can be any word you wish and you can setup as many campaigns as you wish. Setting up a campaign is as easy as just putting the link out there like the one above.