diff --git a/plugins/metadata/config.yml.dist b/plugins/metadata/config.yml.dist
index e5bc110..e21424f 100644
--- a/plugins/metadata/config.yml.dist
+++ b/plugins/metadata/config.yml.dist
@@ -5,6 +5,7 @@ open_graph:
   types:
     article: article
     event: app_scope:event
+    forum: app_scope:discussion
     uploaded_file: app_scope:document
     image: app_scope:picture
 
diff --git a/plugins/metadata/lib/ext/forum.rb b/plugins/metadata/lib/ext/forum.rb
new file mode 100644
index 0000000..6237a99
--- /dev/null
+++ b/plugins/metadata/lib/ext/forum.rb
@@ -0,0 +1,9 @@
+require_dependency 'forum'
+
+class Forum
+
+  metadata_spec namespace: :og, tags: {
+    type: proc{ |p, plugin| plugin.context.params[:og_type] || MetadataPlugin.og_types[:forum] || :forum },
+  }
+
+end
--
libgit2 0.21.2