Simple mixin to spits out specific social platform link styles. Just tie the class name to the markup. (example: http://drocarmo.com/)

social.css

/* Use-case output */

a.github {
  color: #333333;
}
a.github:hover, a.github:active {
  color: #1a1a1a;
}
a.rdio {
  color: #006ed2;
}
a.rdio:hover, a.rdio:active {
  color: #00539f;
}
a.twitter {
  color: #00aced;
}
a.twitter:hover, a.twitter:active {
  color: #0087ba;
}

social.scss

// Variables

$behance: #1769ff;
$dribbble: #ea4c89;
$facebook: #3b5998;
$github: #333;
$instagram: #517fa4;
$linkedin: #007bb6;
$quora: #a82400;
$rdio: #006ed2;
$tumblr: #32506d;
$twitter: #00aced;

// Mixin

@mixin social($name, $color) {
  &.#{$name} {
    color: $color;

    &:hover,
    &:active {
      color: darken($color, 10%);
    }
  }
}

// Use-case

a {
  @include social(github, $github);
  @include social(rdio, $rdio);
  @include social(twitter, $twitter);
}