Recently i ran across pages of my website being indexed by someone linking to me. I cant seem to find where its coming from. Here is what is happening though. I am getting indexed for pages like this website.com/?referer=sphere_search instead of just website.com Does anyone know how I can stop this in my robots.txt or .htaccess? More and more pages are getting indexed. Its causing a duplicate content penalty now and I am seeing my index page disappear sometimes now. Thanks