You can create feed dialogues on Facebook simply by navigating to a URL. You don't need to include the hefty Facebook JavaScript SDK (unless you need post published callbacks).
Here's a demo with some JavaScript that will open the dialogue as a popup window at the correct size. If the popup is blocked, it will fall back to a target="_blank".
The feed properties are documented here: http://developers.facebook.com/docs/reference/dialogs/feed/