I'm using simple facebook connect plugin, with just the base and comments mods. It works fine, but it's pushing my site up to the top of the browser in IE7. I've tried uninstalling all my plugins thinking it might be conflicting with share this or linkwithin, but it still did it.
I even tried adding a 20px margin to the top of the #wrapper in my IE css. Seems to be doing it with just regular twentyten theme too.
http://zeaks.org is my site, only does it in IE7.