Give them the URL
Got it... So either way its really a link just like any other whether you publish from InDesign directly to your own FB acct or copy the link and share it... Just needed clarification.
You can get an embed code by going to the document on line and clicking the embed code button.
Publish Online has integrated sharing to Facebook, twitter or via mail.
In the bottom tool bar, there is a share button, click on the button in the opened Share dialog, click on any of the social widgets to get your document shared across.