You can accomplish this by using an “Action Hook Widget Area” from the Advanced tab of Graphene options. I’m just not sure where it should go.
Basically, you click on a selection in the “Action Hook Widget Area” and then go to your widgets pane, where you will now see a widget area for what you selected. Drag a text widget to that area and paste your FB code into it.
Try using a widget area in either “graphene_header” or “graphene_container_before”. One of these should work. (If not, one of the other selections should.)
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