You could always filter them out via Webmaster's tools.
Here's Google's official docs on it. http://support.google.com/webmasters/bin/answer.py?hl=en&answer=1235687
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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
You could always filter them out via Webmaster's tools.
Here's Google's official docs on it. http://support.google.com/webmasters/bin/answer.py?hl=en&answer=1235687