Hi, I've designed a website which allows users to refer other users using a unique link like this one: http://www.learniacs.com/ref/5 When a user links to my site using his unique referral link, the same welcome page is shown. (http://www.learniacs.com/ref/1 = http://www.learniacs.com/ref/5) I don't know how bad this could be for my SEO, but I guess it would be a good idea if I can set up something (like a robots.txt file, or something in my Google Webmaster Tools account), to track all these links as they were linking to http://www.learniacs.com directly. Is there a way to do that? Thank you.