Looking at our code, it strips out line breaks and HTML/php code. If you pass HTML tags to Facebook, they'll be posted as plain text. However, I do notice that if you do a manual post from the front-end and put a carriage return, it will show up in the post. We'll have to investigate improving our tag stripping to do the carriage returns properly.
Also, I wanted to note, if you're using the Autoposting feature to post to FB, it currently uses the article text to generate the auto-post description (not the og:description on the page). We have plans to improve this, but for now setting the SCOpenGraph tag for description won't update the autopost text.
In short, Alex and I need to look into this more on our side.
-Melissa
Facebook post with line-break
