public function linkedin($summary = '')
    {
        $base = config('laravel-share.services.linkedin.uri');
        $mini = config('laravel-share.services.linkedin.extra.mini');
        $url = $base . '?mini=' . $mini . '&url=' . $this->url . '&title=' . urlencode($this->title) . '&summary=' . urlencode($summary);

        $this->buildLink('linkedin', $url);

        return $this;
    }