Use a Widget Visibility Plugin To Change This Entire Section For Any Page or Post.
Posts that have media-related tests
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This post tests various embed blocks:
Really cool to read through and find so much awesomeness added to WordPress 3.6 while I was gone. I should take three weeks off more often. — Andrew Nacin (@nacin) April 3, 2013 This post tests WordPress’ Twitter Embeds feature.