The property keys MUST have namespaces specified on them, such as og:image, and og:type is required. See https://developers.facebook.com/docs/sharing/opengraph/object-properties for other properties. You can specify nested namespaces inline to define complex properties. For example, the following code will generate a fitness.course object with a location: FBSDKShareOpenGraphObject *course = [FBSDKShareOpenGraphObject objectWithProperties: @{ @"og:type": @"fitness.course", @"og:title": @"Sample course", @"fitness:metrics:location:latitude": @"41.40338", @"fitness:metrics:location:longitude": @"2.17403", }];