Facebook api and send invite to more than one friend in android -

i have problem inviting firend facebook api app. method:

    private void invitefromfacebook(activity activity, list<graphuser> list) {         for(int i=0; i<list.size(); i++) {             //todo post invite friends wall //          log.v("mainactivity", "user id: " + user.getid());              if(list == null || list.size() == 0)                         return;              bundle parameters = new bundle();              string friendsidsinformat = "";              friendsidsinformat = friendsidsinformat + list.get(i).getid();              parameters.putstring("to", friendsidsinformat);             parameters.putstring( "message", "use app!");              facebook mfacebook = new facebook( getresources().getstring(r.string.facebook_app_id));             // show dialog invitation             mfacebook.dialog(activity, "apprequests", parameters, new facebook.dialoglistener() {                 @override                 public void oncomplete(bundle values) {                     // todo auto-generated method stub                  }                   @override                 public void oncancel() {                     // todo auto-generated method stub                  }                  @override                 public void onfacebookerror(facebookerror e) {                     // todo auto-generated method stub                  }                  @override                 public void onerror(dialogerror e) {                     // todo auto-generated method stub                  }             });         }     } 

everyting ok, want send invitation many frieds, in codes show 1 dialog every person. how can show 1 dialog, many friends? possible or must every friend show dialog?

you can send comma delimited list in "to" field, "123,456,789".

be careful sending many requests though, don't want identified spam app.