I installed the Social Marketing plugin last night, and notice two issues:
1. When clicking facebook like, the comments box is as narrow as the facebook icon, preventing its use. Further it appears the popup itself is too narrow. I attempted to address this in the stylesheet with some success, however fixing the width in this way prevents the user from being able to access the other social options (+1, tweet, etc).
2. On mobile the coupon panel popup is too large for the viewport
I did see some other mentions of issue #1 above in the blog, but did not see any resolution.