def get_offer_facebook_description(html_parser):
    """
    This method returns the short standardized description used for the default facebook share message.

    :param html_parser: a BeautifulSoup object
    :rtype: string
    :return: The default facebook share message
    """
    fb_description = html_parser.find(attrs={'name': 'description'}).attrs['content']
    return fb_description