Here's how to adding new variable for the Author Pane
function template_preprocess_author_pane(&$variables) {
$variables['user_follow'] = '';
$uid = $variables['account']->uid;
$name1 = 'twitter';
$name2 = 'googleplus';
$twitter = db_query('SELECT path FROM {follow_links} WHERE uid = :uid and name = :name', array(':uid' => $uid, ':name' => $name1))->fetchField();
$googleplus = db_query('SELECT path FROM {follow_links} WHERE uid = :uid and name = :name', array(':uid' => $uid, ':name' => $name2))->fetchField();
if (!empty($twitter)) {
$twitter = ' <a href="' .$twitter. '"><img typeof="foaf:Image" alt="Follow me on Twitter" title="Follow me on Twitter" src="/sites/all/modules/follow/icons/wpzoom26/icon-twitter.png"/></a> ';
$variables['user_follow'] .= $twitter;
}
if (!empty($googleplus)) {
$google = ' <a rel="author" href="' .$googleplus. '"><img typeof="foaf:Image" alt="Follow me on Google+" title="Follow me on Google+" src="/sites/all/modules/follow/icons/wpzoom26/icon-googleplus.png"/></a> ';
$variables['user_follow'] .= $google;
}
}
After that add the following code in author-pane.tpl.php or advanced-forum.naked.author-pane.tpl.php.
<?php /* Follow */ ?>
<?php if (isset($user_follow)): ?>
<div class="author-pane-line author-follow">
<?php print $user_follow; ?>
</div>
<?php endif; ?>
Module used are Follow, Author Pane, and Advanced Forum.