Take a look at the this link. Scroll down a bit and you should see a Facebook comments plugin with an embedded Google map right beneath it.
My problem is, there is a ton
There are several contributing factors:
.fbFeedbackContent
min-height: 165px
iframe
height: 200px
span
fb:comment
Addressing any or all of these should get you started. You may need to use !important to override some of the CSS.
!important