---- It is easy for competitors to hurt established sites (negative SEO)
lucy24 - 8:24 pm on Dec 14, 2013 (gmt 0)
Also, it's very likely that hackers have cloaked their changes to your site so that they're invisible to you, but they are served up to Googlebot.
Can you explain how this is done, physically? That is: I could easily throw together a set of RewriteRules that shows different content depending on UA or IP or referer or other variable of your choice. But the rule would disappear within a few days when I next modify the htaccess file. So wouldn't they have to keep hacking into the site forever?