History: Unfurl
Source of version: 2 (current)
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{QUOTE(source_url="https://medium.com/slack-developer-blog/everything-you-ever-wanted-to-know-about-unfurling-but-were-afraid-to-ask-or-how-to-make-your-e64b4bb9254#.g0art0991")}Those handy little previews you see when you paste a link into a Slack message are what we refer to as unfurling internally at Slack (and also in Slack’s API documentation). While it may sound like a made up bit of tech jargon, it’s an actual word that means “to spread out from a rolled or folded state” which is what Slack attempts whenever it encounters a link.{QUOTE}
https://github.com/oscarotero/Embed/
https://packagist.org/packages/embed/embed
https://github.com/mpratt/Embera
https://www.openhub.net/p/essence-extract