I think that changing the Facebook button layout will already solve a lot. Right now it’s too wide for placement on the same line, so make it a little shorter by adding
layout="button_count" and change the width from 450 to 100 or so. Unless you really want all the faces to show and have it that width, and use different styling, in which case I would [email protected]’s suggestion.
Anyway, change the FB button into something like this and it might look better already: