http://*.flickr.com/*
http://www.flickr.com/services/oembed/
http://*.pownce.com/*
http://api.pownce.com/2.1/oembed.{format}
https://*.twitter.com/*
https://api.twitter.com/1/statuses/oembed.{format}
http://*.vimeo.com/*
http://vimeo.com/api/oembed.{format}
http://*.youtube.*/*
YouTubeProvider