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I would go for a long post in view of both SEO and user experience actually. In terms of SEO, breaking up content into very short articles will shorten the length of each page, which may not be seen positively by Google. This can work out if you have a really long article, but with reference to the link you provided, I feel it would be better if it can be all in one page. From a user experience viewpoint, it can be quite annoying for users to be clicking several times just to read the entire article. You would also have to optimise each page to load quickly (e.g. Mashable gallery posts), otherwise it will drive people away easily after reading the first 2-3 pages.

If only we had Google's computer budget, or even their food budget, to throw into our server farm! We do realize that we can't cover everything and that for an audit you will need multiple tools. Keep in mind that Bing offers link information, even for sites you haven't verified in their Webmaster Tools.

Hi Keri.  Thanks for following up.  This turned out to be an issue with an auto-generated breadcrumbs script.  I don't know what the intricacies of that were but we were able to remove it and get this issue straightened out. Thanks again! Megan