Sourced from an early postach.io post - http://blog.postach.io/new-embed-support-for-twitter-vimeo-youtube-about-me-and-more

Tweets can also be embedded now! Simply use the full-url to the specific tweet, and we'll do the rest.

We now support sharing on Facebook! Just connect your account and tag posts with "fb" - we'll do the rest. Enjoy ;)
— Postach.io (@postachio) June 5, 2013

view rawtwitter_shortcode_example hosted with ❤ by GitHub