My website was hit with a penalty recently, losing approximately 35% of traffic overnight. I have been reading up on Panda and Penguin (had never heard of them before). One of the recommendations many people offer is to cut down on the number of "low-quality" pages. Now, I run a website with lots of user-submitted content, and each user submitted page also has pages like "comment", "report abuse", "tell friend", etc, associated with it. The content of all those pages is 95% identical, just a few words changing, but they all have unique URLs. I suspect that these are the pages that are giving me the penalty, since they are actually 80% of all the pages on the site, because each item of legitimate content links to several of these "auxiliary" pages.
Should I block Googlebot from visiting these pages?