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Good point - I agree. In my opinion this affects the accuracy of using OSE as backlink analysis tool.

I also did some additionally testing and it seems like this issue isn't necessarily root domain specific. Ie: name1.tumblr.com shows a PA1 DA1 and name2.tumblr.com shows PA 1 DA 98. So is the issue with OSE or is it with the host website?

Thanks - David. If I recall correctly, OSE used to show the DA of the root regardless of the site. As you mentioned it now appears to be selective...or inconsistent if you will.

Has anyone ever experienced a domain authority of 1, 0 links for web 2.0 websites like tumblr, wordpress, weebly, etc? I know it's normal to see a page authority of 1 if there are no links to a url or if opensite explorer hasn't been updated.

Is this some kind of bug with opensite explorer?

Yes you can submit the same video to as many different video sharing websites as you want. I would suggest writing a unique description for each video. One question to ask yourself is are you providing users/viewers with quality content or are you just creating spam...something to consider anyways.

I am working on a wordpress website that uses the WP E-Commerce plugin. I am using the Yoast seo plugin but not totally familiar with it. I have noticed that WP E-Commerce creates duplicate content issues.

Here's an example: http://www.domain.com/parent-category/product-url-1/ is the same content as http://www.domain.com/parent-category/child-category/product-url-1/.

I was wondering which of these following options are the best solution:

1. 301 redirect the multiple instances to one page
2. noindex all but one instance
3. Use the canonical tag (i've used this tag before for telling SE's to use the www version of a page but not sure if it's the appropriate for this)
4. a combination of one of these 3 options?

Thanks in advance!