Index: wp-includes/class-oembed.php
===================================================================
--- wp-includes/class-oembed.php	(revision 19617)
+++ wp-includes/class-oembed.php	(working copy)
@@ -47,6 +47,7 @@
 			'http://wordpress.tv/*'                         => array( 'http://wordpress.tv/oembed/',              false ),
 			'#http://(.+\.)?polldaddy\.com/.*#i'            => array( 'http://polldaddy.com/oembed/',             true  ),
 			'#http://(www\.)?funnyordie\.com/videos/.*#i'   => array( 'http://www.funnyordie.com/oembed',         true  ),
+			'#http(s)?://(www\.)?twitter.com/.+?/status(es)?/.*#i' => array( 'http://api.twitter.com/1/statuses/oembed.{format}', true),
 		) );
 
 		// Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().