Slide Out Social Icon Buttons
These space saving social buttons slide out into view one at a time when the user clicks on the main button. The social icons appear tucked away and invisible initially, by placing them inside the "back face" of a DIV and setting the DIV to "backface-visibility: hidden".

Spinning icons using CSS3 transform
An effect that seems to be popping up with increased frequency is the spinning image, or more precisely, icons. Move the mouse over an icon, and it spins (rotates) on its axis to draw attention to itself. This is realized using CSS3's transform: rotate(xdeg) property.