curioustoddler - 10:33 am on Jul 1, 2010 (gmt 0)

I have a question here.
Suppose you run a real estate site where any user or real estate agent can come and list their properties. Now over a period of time for each city you have hundreds of listings and gradually your site has few hundred city pages which you can manage to be different and rest of thousands of real estate listings which are available on hundreds of other sites. These people who post listings, just copy and paste on each site. They are duplicate pages on hundreds of sites. So whether they should be nofollow( noindex also) or they should be allowed to be indexed and treated as supplemental pages. This is not a hypothetical situation. I am facing this and i believe lots of others will also need to know this.