Should you publish Q&A on individual pages?
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If you are answering common questions about your industry, should you create a separate page or place it on a existing page that is related.
On one hand it may be seen as thin content on those pages. On the other hand it may be a poor user experience if someone lands on your page and has to scroll down to find the answer.
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I'd say this would really depend on how thin the pages are at the moment where you could add the questions and how long possible answers may be. If you answer the question if the sun is shining then yes I would probably add them to the existing pages. If you're really going to create a research on why the sun is not shining including quotes from Al Gore I would recommend creating new pages for this. It's a bit of a lame example but hopefully you see my point on this.
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The Q&A section you're posting in now uses separate pages

But it really depends on how much content you are putting in your Q&As. If it's just a sentence or two it's probably best to combine them all into one page. If you're writing 500 word articles with videos & graphics, it's better to have separate pages, and maybe include an overview page that includes all the questions as well as excerpts of all the answers, with links to view more.
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I completely agree with Martijn and Takeshi in that whether or not you should make unique pages for each question depends on how in-depth the answers are.
I'd like to add that whether you create a single Q&A page or an overview page, you can easily mitigate the usability issue by using anchor tags. List all the questions at the top of the page and then break out the individual questions and answers(or questions and excerpts of answers) below the list. Link each question at the top of the page to the corresponding question and answer further down the page using same-page anchor tags. This will minimize the amount of scrolling required to navigate the page. You can also place same-page anchor tags periodically down the page that jump back to the top of the page.
This FAQ page about CrossFit is an example of using same-page anchor tags both ways: http://www.crossfit.com/cf-info/faq.html. Hope that helps, and best of luck!