In reply to Knut Sparhell.

If you enable another SEO plugin Jetpack will intelligently turn off its own Open Graph tags. Jetpack maintains a list of plugins with potential conflicts with its own features. If one of those plugins is present and active Jetpack will disable its own feature that conflicts. You can view and contribute to the list at https://github.com/Automattic/jetpack/blob/master/class.jetpack.php#L58