I would use divs creating a rt-hand column.
The first would hold the Facebook iFrane - give the box a width of maybe 300 and float it right.
The next is for the Twiiter wiggie - all you have to do with that one is specify a right margin, maybe 300 again or a little more,
Just tweak these values until it looks right.
You could even wrap both of these in another div container with an absolute width for more control, but I don't think that's required. And if I'm not mistaken, this is the classic faux-column technique?
