moodle/course/format/social/format.php

<?php
      // format.php - course format featuring social forum
      //              included from view.php

    $strgroups  = get_string('groups');
    $strgroupmy = get_string('groupmy');
    $editing    = $PAGE->user_is_editing();

    if ($forum = forum_get_course_forum($course->id, 'social')) {

        $cm = get_coursemodule_from_instance('forum', $forum->id);
        $context = get_context_instance(CONTEXT_MODULE, $cm->id);

    /// Print forum intro above posts  MDL-18483
        if (trim($forum->intro) != '') {
            $options = new stdClass();
            $options->para = false;
            $introcontent = format_module_intro('forum', $forum, $cm->id);

            if ($PAGE->user_is_editing() && has_capability('moodle/course:update', $context)) {
                $streditsummary  = get_string('editsummary');
                $introcontent .= '<div class="editinglink"><a title="'.$streditsummary.'" '.
                                 '   href="modedit.php?update='.$cm->id.'&amp;sesskey='.sesskey().'">'.
                                 '<img src="'.$OUTPUT->pix_url('t/edit') . '" '.
                                 ' class="icon edit" alt="'.$streditsummary.'" /></a></div>';
            }
            echo $OUTPUT->box($introcontent, 'generalbox', 'intro');
        }

        echo '<div class="subscribelink">', forum_get_subscribe_link($forum, $context), '</div>';
        forum_print_latest_discussions($course, $forum, 10, 'plain', '', false);

    } else {
        echo $OUTPUT->notification('Could not find or create a social forum here');
    }