Hi Sebastian,
Thanks for the suggestions!
Just released WPSP Pro 0.5 (finally with a bunch of styling options).
Next I’ll be focusing on typography (font sizes, alignment etc..).
Thanks for pointing out the centering issue!
Here’s a fix until the next version:
.wpsp-social-link,
.wpsp-social-link:visited,
.wpsp-li-button, .wpsp-li-button:visited {
margin: 0 5px;
}