Shortcodes (Embeds)

Embeds

All you need to do to embed something into a post or page is to post the URL to it into your content area. Make sure that the URL is on its own line and not hyperlinked (clickable when viewing the post). Source: http://codex.wordpress.org/Embeds

 
Twitter

 
Youtube

 
Vimeo

 
Flickr

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You can use all of these: