def crossposted_content(self):
        """Content to be cross-posted on other sites. This method adds an
        additional line of content with a link back to the original site as
        well as the `#end` tag. This signals the end blog content according
        to: https://support.google.com/blogger/answer/41452?hl=en

        """
        url = "http://{0}{1}".format(self.site.domain, self.get_absolute_url())
        origin = (
            '<p><em>This entry was originally published at: '
            '<a href="{0}">{1}</a>.</em></p>#end'.format(url, url)
        )
        return mark_safe(u"{0}{1}".format(self.content, origin))