buf.append("<head>");
writeMeta(buf, "og:title", title);
writeMeta(buf, "og:type", "website");
+ buf.append("<meta name='twitter:card' content='summary' />");
+ buf.append("<meta name='twitter:site' content='@argeo_org' />");
writeMeta(buf, "og:url", url);
if (desc != null)
writeMeta(buf, "og:description", desc);