I checked the link on YouTube's site. It's what appears when you click the "Share" icon. If you click the "Show Options" link, and then click the "Long link", you get a "YouTube.com" URL to share it. That's what works on this site if you want to embed the video in your post.

The "http://youtu.be/" URL does look suspicious, but it is just a pointer to one of YouTube's many servers.

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