[1] [CITE[The Open Graph protocol]]
( ([TIME[2013-11-12 14:44:05 +09:00]] 版))
<http://ogp.me/>

[2] [CITE@ja[Platform Updates: New Open Graph Tags for Media Publishers and More- Facebook Developers]]
( ([TIME[2013-12-11 02:52:52 +09:00]] 版))
<https://developers.facebook.com/blog/post/2013/06/19/platform-updates--new-open-graph-tags-for-media-publishers-and-more/>

[3] [CITE@ja[Using Self-Hosted Objects - Facebook開発者]]
( ([TIME[2013-12-11 02:53:22 +09:00]] 版))
<https://developers.facebook.com/docs/opengraph/using-objects/>