title: Ads api: request only those creatives that are currently used
body: <p>When using Facebook's Ads API, I'd like to request all creatives for an account that are currently being used by an adgroup. I.e. where the count_current_adgroups value is > 0. I can pull all creatives for the account with:</p>
  
  <p>">https://graph.facebook.com/adcreatives/?ids=act_123456789&amp;access_token=</p>
  
  <p>How do you limit this request to only return adcreatives that are being used by an adgroup?</p>
  
  <p>Thanks.</p>