ARIA accessibile keyboard script allows disabled users to navigate the page left, right, up or down.

aria-accessible-keyboard-script.js

/**
 * SOCIAL SHARING TOOL BAR ARIA
 * @type {[type]}
 * @see  https://dequeuniversity.com/library/aria/content-feedback/sf-social-toolbar
 */
  var $toolbar = $('#social-toolbar');
  var $items = $toolbar.find('li');
  $toolbar.on('keydown', '.button', function (e) {
    var which = e.which;
    var target = e.target;

    if (which === 37 || which === 38) { // LEFT |or| UP
      focusAdjacentItem(target, which, $items);
    } else if (which === 39 || which === 40) { // RIGHT |or| DOWN
      focusAdjacentItem(target, which, $items);
    }
  });