Do you think that the position is fixed and free from an additional viewing window?
#facebookbar { position: fixed; bottom: 0; left: 0; width: 96%; padding: .6em 2%; }
You will need a document element to fill the viewport, of course:
html, body { height: 100%; }
Using an extra div seems more like a hack, and changing the standard behavior is never a good idea.
There are many possibilities for review and testing (scrolling with the mouse wheel, keyboard, touch screen that you have) that you do not need if you keep the standard.
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