https://twitter.com/nacin/status/319508408669708289 This post tests WordPress‘ Twitter Embeds feature.
Posted as per the instructions in the Codex.
[wpvideo tFnqC9XQ w=680] VideoPress, especially as a video post format, usually provides some unique styling issues. You will need to install Jetpack or Slim Jetpack plugin to turn the shortcode into a viewable video.
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