This is a look at some of the third-party metadata that can be attached to content. In this case, 'third-party' refers to the source of the metadata schema, it being a third party such as Facebook or Twitter, specifically Facebook's Open Graph protocol and Twitter Cards. Both of these provide a reliable set of metadata for image previews, video players, and the like, when pages are passed along using a Facebook or Twitter 'share' button. Of course other services can use them too, instead of randomly scraping a page for previews (which is what gRSShopper currently does). This article in A List Apart doesn't just describe the formats, it gives numerous examples and in-depth advice on how to use them.
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