A "card" is merely a convenient name for the concept of microdata/microformats [1], which happens to often be _visually_ represented as a snippet, or a "card".

A "card" is merely a convenient name for the concept of microdata/microformats [1], which happens to often be _visually_ represented as a snippet, or a "card". The real key here is standardizing the various metadata formats, such as the title field; which ranges from Twitter's `twitter:title` to Facebook's `og:title`. [1]: I'm building my augmented reality data network, http://aris.io http://aris.io, based on a similar premise, but abstracting these out to explicit "providers".