Hi friends, I don't know, did you hear "ref=" attacks to your websites? It is a backlink attacks from users that use fake link from your websites. And if they report these links(usually they uses sandboxed url ref to your website for sandbox your sites) to Google , Google will check the ref url and probably Sandbox your website immediately. Yes I'm talking about enemy of yours in the Google Searchs. They can add ref= links to your websites with fake codes and they can convince Google you are support to bad websites. Whatever, i want to teach you how can you erase the Ref links from your indexes and how to block Ref links for your websites. To check your websites for Ref Attacks in Google; You can use this lines for your websites with Google search Did you find any ref attacks in your indexes? So go to Google Webmaster Tools for remove these urls from your indexes. (You can find it in Crawl settings in Google Webmaster Tools) And you can block these ref attacks forever. With Add this to your robots.txt or you can use .htaccess code P.S : you have to change "yourwebsite.com" with your website url I hope it will helps you.