Essentials for ZOO
Issues with SEO 
Category Open Graph 
The Open Graph meta tags can only be applied to ZOO Item views.
The metadata is not being displaying on the Item page 
Make sure the ZOOlanders ZOOseo Plugin is enabled and that the ZOOseo Metadata Item layout is populated.
The Open Graph tags are not being recognized 
Some services, like Facebook, cannot scrape the website when Joomla! GZIP compression is enabled. As currently there is no workaround for it, the best is to keep the compression off when using Open Graph.