Lots of people seem to be experiencing a drop in DA recently. Rand addresses it here: http://moz.com/community/q/big-drop-in-domain-authority#reply_299907
Best posts made by jmorehouse
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RE: Could Spam Analysis significantly lower domain authority?posted in Link Explorer
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RE: Disallow URLs ENDING with certain values in robots.txt?posted in Intermediate & Advanced SEO
Thanks, Andy! I just tested with Webmaster tool's tester, and it worked.
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RE: Should I disallow all URL query strings/parameters in Robots.txt?posted in Intermediate & Advanced SEO
The statement was in a response to a question I asked earlier.
"I was having an issue like this where moz was showing a lot more duplicate content than webmaster tools was, actually webmaster tools showed none, but I was being penalized. I realized this when I added an exclusion to robots.txt to exclude any query strings on my site. After I did this I saw my rankings shoot through the roof."
Thanks for the info. I did edit the settings in the URL parameters section to tell Google that these parameters do not change the page content, so it should now index only one representative URL. My only concern was that the kw (keyword) parameter does change page content for search result pages, but I just read that Matt Cutts encourages disallowing those pages anyway.
Just to verify, disallowing those pages with parameters won't affect the "link juice" passed from external links?