I just want to add that once you create the tracker... go to the page of the hub you want to promote or refer, and scroll to the bottom of the page. Click on where it says: "Share" next to the Vote up and Vote down buttons. A new box will pop up and you can choose which referral tracker you want to use. For example, I have one for FB and one for Twitter, so I can see where people are visiting from and where I can spend my time most wisely. Hope that helps.