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A card in the context of the indieweb are small information summaries—often summaries of specific, external web pages.
For the moment, current indieweb work is focusing on developing a simpler alternative to all the silo-specific card approaches. See:
- (Apple Passbook API/format reference needed)
Facebook uses OGP and other markup on a page to parse data to shows summaries of pages linked to in Facebook posts in a "card" like presentation.
Examples of Facebook "cards" displays:
- link-preview for the first URL in a post
- hovercard shown when hovering the mouse pointer over someone's name, including face, name, friendship status, etc.
Google now uses cards as a method of display of various information - see the Google now page for more overall, and http://www.google.com/landing/now/#cards for examples. Some of Google now's cards appear to be produced from recommendation engines.
Twitter uses OGP and their own proprietary meta tags to provide Twitter Cards functionality in tweets.
Embedly has a card embedding service at http://embed.ly/cards that parses other sites, and generates a card that you can embed, using a variant of oEmbed.
- indiecard - simple independent card markup and parsing
- link-preview - one use case of cards
- posts - see post kinds for an analogy of kinds of cards
- autolink - a card is a type of autolink, it provides context
- notifications - some presentations of notifications being to look like cards