This script is deployed on jon.sprig.gs/redirect.php and those are linked to from /var/www/t -> /var/www/redirect.php etc.

Redirect.php

<?php
switch($_SERVER['REQUEST_URI']) {
  case '/t/':
  case '/@/':
  case '/twitter/':
    redirect("https://twitter.com/JonTheNiceGuy");
    break;
  case '/fb/':
  case '/facebook/':
    redirect("https://www.facebook.com/JonTheNiceGuy");
    break;
  case '/+/':
  case '/g+/':
    redirect("https://plus.google.com/101307558846949684774");
    break;
  case '/d/':
  case '/d*/':
    redirect("https://joindiaspora.com/people/7f1771766a74695d");
}

function redirect($url) {
  if (isset($_GET['test'])) {
    echo "Redirecting to $url";
  } else {
    header("Location: $url");
  }
}