POST /v21.0/act_<AD_ACCOUNT_ID>/adlabels HTTP/1.1
Host: graph.facebook.com

name=My+Label+1

/* PHP SDK v5.0.0 */
/* make the API call */
try {
  // Returns a `Facebook\FacebookResponse` object
  $response = $fb->post(
    '/act_<AD_ACCOUNT_ID>/adlabels',
    array (
      'name' => 'My Label 1',
    ),
    '{access-token}'
  );
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}
$graphNode = $response->getGraphNode();
/* handle the result */

/* make the API call */
FB.api(
    "/act_<AD_ACCOUNT_ID>/adlabels",
    "POST",
    {
        "name": "My Label 1"
    },
    function (response) {
      if (response && !response.error) {
        /* handle the result */
      }
    }
);

Bundle params = new Bundle();
params.putString("name", "My Label 1");
/* make the API call */
new GraphRequest(
    AccessToken.getCurrentAccessToken(),
    "/act_<AD_ACCOUNT_ID>/adlabels",
    params,
    HttpMethod.POST,
    new GraphRequest.Callback() {
        public void onCompleted(GraphResponse response) {
            /* handle the result */
        }
    }
).executeAsync();

NSDictionary *params = @{
  @"name": @"My Label 1",
};
/* make the API call */
FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
                               initWithGraphPath:@"/act_<AD_ACCOUNT_ID>/adlabels"
                                      parameters:params
                                      HTTPMethod:@"POST"];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
                                      id result,
                                      NSError *error) {
    // Handle the result
}];

curl -X POST \
  -F 'name="My Label 1"' \
  -F 'access_token=<ACCESS_TOKEN>' \
  https://graph.facebook.com/v21.0/act_<AD_ACCOUNT_ID>/adlabels