--- /dev/null
+<?php
+
+namespace Drupal\metatag_open_graph\Plugin\metatag\Tag;
+
+use \Drupal\metatag\Plugin\metatag\Tag\MetaPropertyBase;
+
+/**
+ * The Open Graph "Site name" meta tag.
+ *
+ * @MetatagTag(
+ * id = "og_site_name",
+ * label = @Translation("Site name"),
+ * description = @Translation("A human-readable name for the site, e.g., <em>IMDb</em>."),
+ * name = "og:site_name",
+ * group = "open_graph",
+ * weight = 1,
+ * type = "label",
+ * secure = FALSE,
+ * multiple = FALSE
+ * )
+ */
+class OgSiteName extends MetaPropertyBase {
+ // Nothing here yet. Just a placeholder class for a plugin.
+}