Source: https://meta.discourse.org/t/what-is-a-onebox/4546
One very cool feature Discourse has is “oneboxing”. If you include a link to your favourite site, it will try to create a usable snippet for you automatically.
For example: paste the link http://en.wikipedia.org/wiki/Spite_house
on a line by itself and you will see a nice onebox from Wikipedia
Some samples:
http://meta.discourse.org/t/how-do-you-spoiler-an-image-or-onebox/55
http://meta.discourse.org/t/how-do-you-spoiler-an-image-or-onebox/55
http://meta.discourse.org/t/how-do-you-spoiler-an-image-or-onebox/55/2
http://meta.discourse.org/t/how-do-you-spoiler-an-image-or-onebox/55/2
http://en.wikipedia.org/wiki/Spite_house
http://en.wikipedia.org/wiki/Spite_house
http://www.amazon.com/Walter-Farting-Farts-Picture-Puffins/dp/0141382074
http://www.amazon.com/Walter-Farting-Farts-Picture-Puffins/dp/0141382074
https://play.google.com/store/apps/details?id=com.machineworksnorthwest.duke3d
https://play.google.com/store/apps/details?id=com.machineworksnorthwest.duke3d
https://itunes.apple.com/us/app/duke-nukem-3d/id325995561?mt=8
https://itunes.apple.com/us/app/duke-nukem-3d/id325995561?mt=8
https://gist.github.com/3200829
https://gist.github.com/3200829
https://github.com/rack/rack/blob/master/lib/rack/etag.rb
https://github.com/rack/rack/blob/master/lib/rack/etag.rb
http://www.flickr.com/photos/eho/149282456/
http://www.flickr.com/photos/eho/149282456/
http://imgur.com/gallery/1PGTI
http://imgur.com/gallery/1PGTI
http://thenextweb.com/au/2012/11/18/kim-dotcoms-plan-to-give-new-zealanders-free-internet-could-just-work/?fromcat=au
http://thenextweb.com/au/2012/11/18/kim-dotcoms-plan-to-give-new-zealanders-free-internet-could-just-work/?fromcat=au
http://www.youtube.com/watch?v=9bZkp7q19f0
http://www.youtube.com/watch?v=9bZkp7q19f0
http://www.funnyordie.com/videos/05c8ec50ed/between-two-ferns-with-zach-galifianakis-richard-branson
http://www.funnyordie.com/videos/05c8ec50ed/between-two-ferns-with-zach-galifianakis-richard-branson