code: protected String getFacebookFieldName(FieldWithAnnotation<Facebook> fieldWithAnnotation) {
      String facebookFieldName = fieldWithAnnotation.getAnnotation().value();
      Field field = fieldWithAnnotation.getField();
  
      // If no Facebook field name was specified in the annotation, assume
      // it's the same name as the Java field
      if (isBlank(facebookFieldName)) {
        MAPPER_LOGGER.trace("No explicit Facebook field name found for {}, so defaulting to the field name itself ({})",
          field, field.getName());
  
        facebookFieldName = field.getName();
      }
  
      return facebookFieldName;
    }
docs: For a Java field annotated with the {@code Facebook} annotation, figure out what the corresponding Facebook JSON
  field name to map to it is.
  
  @param fieldWithAnnotation
  A Java field annotated with the {@code Facebook} annotation.
  @return The Facebook JSON field name that should be mapped to this Java field.