Solution for me:
--- a/src/meta/tags.js
+++ b/src/meta/tags.js
@@ -29,6 +29,9 @@ module.exports = function(Meta) {
property: 'og:site_name',
content: Meta.config.title || 'NodeBB'
}, {
+ property: 'og:type',
+ content: 'website'
+ }, {
name: 'keywords',
content: Meta.config.keywords || ''
