Will DiggBar create duplicate content issues?

Matt's answer:

CUTTS: Okay, a question from Remiz Rahnas in Kerela, India. Remiz asks, “Will DiggBar create duplicate content issues? For example, my site is example.com and now when you add digg.com before my site’s address, digg.com/example.com, it is showing a page from Digg with my content exactly the same. So, will the Diggbar create duplicate content issues?” The short answer is no. So as Digg originally launched it, it could have caused duplicate content issues. And, in fact, it could have resulted in pages from Digg being removed from Google. But they made a number of changes that made things better. The big one in Google’s point of view is that it added a meta no-index tag. So that essentially says, “Anything that we know of, you know, that’s on Digg, that’s one of this framed shortened URLs, will have a no-index tag which tells Google not to index that page. We just don’t show any reference to it at all in our search results.” So the fact that we’ll see two copies and one is a meta no-index means, yes, we won’t show this one and so we should correctly assign all the page rank and all the other characteristics to your original content. So the DiggBar, as originally implemented, was a little bit dangerous, but they quickly adjusted and iterated and made some changes that made it such that you shouldn’t have duplicate content issues. Now, as a webmaster, do I like people frame me in my site without my permission? I’m not a huge fan of that. So there’s a lot of people who think the DiggBar is rude, but when I just put on my search engine policy hat, it is no longer a violation of search engine quality guidelines–or at least Google’s quality guidelines–and it shouldn’t cause any duplicate content issues for your site.

by Matt Cutts - Google's Head of Search Quality Team

Original video: