You need to write "youtube:", followed by the video code (which is 11 random letters and symbols).
e.g. youtube:kjgHbDae_FE
You can also embed photos and videos by including a direct link to them.
This works with the following content providers:
- 5min
- Blip.tv
- Clearspring
- DailyMotion
- DeviantArt
- Flickr
- FunnyOrDie.com
- Giphy
- Hulu
- My Opera
- oohEmbed
- PhotoBucket
- PollDaddy.com
- Poll Everywhere
- Pownce
- Qik
- Revision3
- Scribd
- SmugMug
- Spotify
- Streamable
- Tiktok
- Viddler
- Vimeo
- WatchFighters
- WatchFighters
- WordPress.tv
- YouTube