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Are there any free tools that will crawl a full website and report back on any broken tags? My site recently added several thousand previously archived posts, many of which contain old tags that no longer exist. ScreamingFrog's crawl is too limited to reach most of these posts, and I haven't been able to find another free tool to get the job done. If there's no free tool, does anyone know of an affordable paid alternative?

Not too long ago, Dublin Core was all the rage. Then Open Graph data exploded, and Schema seems to be highly regarded. In a best-case scenario, on a site that's already got the basics like good content, clean URLs, rich and useful page titles and meta descriptions, well-named and alt-tagged images and document outlines, what are today's best practices for microdata? Should Open Graph information be added? Should the old Dublin Core be resurrected? I'm trying to find a way to keep markup light and minimal, but include enough microdata for crawlers to get a better sense of the content and its relationships to other subdomains and sites.