Firstly, let me say that I think this is a great little no-fuss widget. Secondly, I should inform you that I am very inexperienced with WordPress.
That said; I have the widget up and running in the right sidebar. The rest of the right sidebar consists of boxes with various contents, such as search-form, blogroll, archive, etc. To make it all look nice, there is a 20px padding between the boxes.
But, for some reason, the Facebook-widget does not adher completely to the padding. The Facebook-widget ignores the padding when it comes to the distance between it, and the box under it.
Feel free to examine the problem, at http://www.rytman.no