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SeoMoz crawler indicated a few times that my site has a duplicate home page error (http://mysite.com and www.mysite.com) I eliminated the the couple remaining internal links that pointed to http://mysite on a couple pages (all other internal links point to http://www.mysite.com) I ran the crawl again and it said no errors this time.  I naturally thought the duplicate page error problem was fixed. However this morning I got the regularly scheduled crawl report from SeoMoz that said again I have those duplicate error pages. No changes were made to any of my site's pages between the crawls. That makes me wonder if the crawler is providing false positives at times or was wrong when it said on the crawl a couple days ago that I don't have any errors (no duplicate page error). Now, I don't know what to think.

Search engine analysis is indicating that my site has twin home pages (www.mysite.com and http://mysite.com). The error message I'm getting is:  "your website resides at both www.mysite.com and mysite.com. My uploaded index page is a .htm page (not .html).  I don't know if that matters. Can someone explain how this happened and what I can do to fix it? Thanks!

Is there a risk that Google will de-index your site or lower your ranking if you have too many backlinks from free classifed sites?  I would just use 1 free ad per classified website.  Thanks.