Printing NSData using NSLog

How can I print the contents of an NSData object using NSLog:

-(void) post:(NSString*) msg to:(NSString*) link{
    NSString *myRequestString = [NSString stringWithFormat:@"message=%@", msg];
    NSData *myRequestData = [NSData dataWithBytes: [myRequestString UTF8String] length: [myRequestString length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: link]]; 
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
    [request setHTTPMethod: @"POST"];
    [request setHTTPBody: myRequestData];
    NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil];
    NSLog("%@", *returnData); //doesn't work

}

I would like to print the contents of *returnData...