Support: http://kopatheme.com/forums/topic/pinterest-and-youtube-icons-not-showing-in-socials-widget/

kopa_widget_socials.php

/**
 * @since Nictitate 1.0
 */
class Kopa_Widget_Socials extends WP_Widget {

    function __construct() {
        $widget_ops = array('classname' => 'kopa-social-widget', 'description' => __('Socials Widget', kopa_get_domain()));
        $control_ops = array('width' => 'auto', 'height' => 'auto');
        parent::__construct('kopa_widget_socials', __('Kopa Socials', kopa_get_domain()), $widget_ops, $control_ops);
    }

    function widget($args, $instance) {
        extract($args);
        $title = apply_filters('widget_title', empty($instance['title']) ? '' : $instance['title'], $instance, $this->id_base);
        $facebook = get_option( 'kopa_theme_options_social_links_facebook_url' );
        $twitter = get_option( 'kopa_theme_options_social_links_twitter_url' );
        $rss = get_option( 'kopa_theme_options_social_links_rss_url' );
        $flickr = get_option( 'kopa_theme_options_social_links_flickr_url' );
        $pinterest = get_option( 'kopa_theme_options_social_links_pinterest_url' );
        $dribbble = get_option( 'kopa_theme_options_social_links_dribbble_url' );
        $vimeo = get_option( 'kopa_theme_options_social_links_vimeo_url' );
        $youtube = get_option( 'kopa_theme_options_social_links_youtube_url' );
        $instagram = get_option( 'kopa_theme_options_social_links_instagram_url' );

        echo $before_widget;

        if ( ! empty( $title ) )
            echo $before_title . $title . $after_title;

        if ( empty( $facebook ) &&
             empty( $twitter ) && 
             $rss == 'HIDE' &&
             empty( $flickr ) &&
             empty( $pinterest ) &&
             empty( $dribbble ) &&
             empty( $vimeo ) &&
             empty( $youtube ) && 
             empty( $instagram ) ) {
            
            echo $after_widget;
            return;
        }
        ?>

        <ul class="clearfix">
            <?php if ( ! empty( $twitter ) ) : ?>
                <li><a href="<?php echo esc_url( $twitter ); ?>" data-icon="&#xe16c;"></a></li>
            <?php endif; ?>

            <?php if ( ! empty( $facebook ) ) : ?>
                <li><a href="<?php echo esc_url( $facebook ); ?>" data-icon="&#xe168;"></a></li>
            <?php endif; ?>

            <?php if ( $rss != 'HIDE' && $rss == '' ) : ?>
                <li><a href="<?php bloginfo( 'rss2_url' ); ?>" data-icon="&#xe16f;"></a></li>
            <?php elseif ( $rss != 'HIDE' ) : ?>
                <li><a href="<?php echo esc_url( $rss ); ?>" data-icon="&#xe16f;"></a></li>
            <?php endif; ?>

            <?php if ( ! empty( $flickr ) ) : ?>
                <li><a href="<?php echo esc_url( $flickr ); ?>" data-icon="&#xe178;"></a></li>
            <?php endif; ?>

            <?php if ( ! empty( $pinterest ) ) : ?>
                <li><a href="<?php echo esc_url( $pinterest ); ?>" data-icon="&#xe1a5;"></a></li>
            <?php endif; ?>
            
            <?php if ( ! empty( $dribbble ) ) : ?>
                <li><a href="<?php echo esc_url( $dribbble ); ?>" data-icon="&#xe17e;"></a></li>
            <?php endif; ?>
            
            <?php if ( ! empty( $vimeo ) ) : ?>
                <li><a href="<?php echo esc_url( $vimeo ); ?>" data-icon="&#xe174;"></a></li>
            <?php endif; ?>

            <?php if ( ! empty( $youtube ) ) : ?>
                <li><a href="<?php echo esc_url( $youtube ); ?>" data-icon="&#xe172;"></a></li>
            <?php endif; ?>

            <?php if ( ! empty( $instagram ) ) : ?>
                <li><a href="<?php echo esc_url( $instagram ); ?>" data-icon="&#xe16b;"></a></li>
            <?php endif; ?>
        </ul>

        <?php 
        echo $after_widget;
    }

    function form($instance) {
        $default = array(
            'title'       => ''
        );
        $instance = wp_parse_args((array) $instance, $default);
        $title = strip_tags($instance['title']);
        ?>

        <p>
            <label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:', kopa_get_domain()); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($title); ?>" />
        </p>
        
        <?php
    }

    function update($new_instance, $old_instance) {
        $instance = $old_instance;
        $instance['title'] = strip_tags( $new_instance['title'] );

        return $instance;
    }

}