code: public boolean fbml_refreshImgSrc(URL imageUrl)
      throws FacebookException, IOException {
      return extractBoolean(this.callMethod(FacebookMethod.FBML_REFRESH_IMG_SRC,
                                            new Pair<String, CharSequence>("url",
                                                                           imageUrl.toString())));
    }
docs: Recaches the image with the specified imageUrl.
  @param imageUrl the image URL to refresh
  @return boolean indicating whether the refresh succeeded