Misalignment of Facebook & Twitter buttons

Question

The page contains two buttons, from twitter and from facebook.

What I\'m observing in Firefox 3.5.15 is:

1. While the page is loading, the buttons are more or

Answer 1

All I did was add the CSS to my page:

div.fb_iframe_widget > span {
    vertical-align: unset !important;
}

This is a bit less opinionated than some of the answers here and isolates the change to only undoing the height adjustment on the Facebook share icon.