Today I realized that FB login button no longer renders correctly in chrome (maybe because of browser update - who knows). Take a look at this http://goo.gl/mK6sf website in both IE and Chrome. Each button has some extra 'padding-top' in chrome and the iframe is not hidden correctly. Here is png preview http://goo.gl/sfUl5
EDIT How to make FB login button to render correctly like in IE? Do you see similar issue on other websites? Has facebook changed something or it's Chrome to blame?
EDIT2 2013-01-16 Take a look at this thread: https://developers.facebook.com/bugs/592452207446912 This is probably Facebook API error. I will post a response when they fix it.