LOVE your plugin!
I concur with cphanson about adding the additional margin as a default part of the code after the bio box. We had to modify it on about 60 sites.
Also, could the code be made responsive?
This would help greatly with mobile appearance AND it would allow the Social Author Bio box to resize automatically when changing themes with different column widths or when changing a page to multiple columns etc.
Example, on this site, the Social Author Bio Box is the only element that will not resize responsively to mobile devices which messes with the way the entire site width behaves on mobile.
These two tweaks would make your great plugin even better.
Thanks for considering them!