Question

How I can use

FB.ui({
      method: 'apprequests',
      message: 'Gooby pls'
}, requestCallback);

to send a request for my app ONLY to friends that have not received a request yet?

Answer 1

If you have a database of some kind of who’s got requests from who (probably already has), you can use the request dialog’s exclude_ids field to remove them from the list. Just list the user ids:

 FB.ui({
     method: 'apprequests',
     message: 'Gooby pls',
     exclude_ids: ['42'] // add real facebook user ids here
}, requestCallback);