diff --git a/_layouts/default.html b/_layouts/default.html
index bd807d5..e87d6a2 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -5,6 +5,11 @@
 		<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
 		<title>{{ page.title }}</title>
 		<meta name="viewport" content="width=device-width">
+{% if page.thumbnail != null %}
+		<link rel="image_src" href="{{ page.thumbnail | escape_once }}">
+{% if page.image != null %}
+		<link rel="image_src" href="{{ page.image | escape_once }}">
+{% endif %}
 {% bundle %}
 - /css/bootstrap.css
 - /css/sticky-footer-navbar.css