That's strange. Shouldn't Google be using frequency analysis to determine likely key words? Shouldn't "Disqus" appear so often on high-value sites that Google decides the word is virtually content-free?
it probably does, webmaster tools shows keywords that are common, which doesn't mean they are meaningful. That information is mostly to check that you are not missing out your keywords completely.
For example, any tumblr blog will have "ask", "submit" and "liked" as the most common words, even though they will have zero weight in your positioning, the links they are in are likely marked as nofollow and they are blocked in robots.txt
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[ 2.8 ms ] story [ 27.2 ms ] thread* Slow load times
* Overzealous spam triggers
* Poor Twitter/Facebook integration
Yes, this is only one user's experience but it's enough to make me stop leaving comments on publishers' websites.
For example, any tumblr blog will have "ask", "submit" and "liked" as the most common words, even though they will have zero weight in your positioning, the links they are in are likely marked as nofollow and they are blocked in robots.txt