-            webpage, 'description', fatal=False)
-        thumbnail = self._og_search_thumbnail(webpage)
+            webpage, 'description', default=None)
+        if description is None:
+            description = clean_html(self._html_search_meta('description', webpage))
+
+        thumbnail = self._og_search_thumbnail(webpage, default=None)
+        if thumbnail is None:
+            fb_sharer_url = self._search_regex(
+                r'<a[^>]+href="(https?://www\.facebook\.com/sharer/sharer\.php?[^"]+)"',
+                webpage, 'facebook sharer URL', fatal=False)
+            sharer_params = compat_parse_qs(compat_urllib_parse_urlparse(fb_sharer_url).query)
+            thumbnail = sharer_params.get('p[images][0]', [None])[0]