Im trying to send an app request through facebook using the facebook iOS SDK, im using the following code:
NSString *message = [[NSString alloc] initWithFormat:@
I was able to send a request using Ruby via a standard POST to /me/apprequests. I supplied an valid access_token for the app and the "message" parameter. It's possible, the iOS SDK just doesn't have a dialog for it yet.
NOTE: the user has to have installed the application once before you can send them notifications and invites. So Andrew is correct. There's no way to send an app request to invite someone to join a new app quite yet.