code: public static void setFacebookDomain(String facebookDomain) {
          if (!BuildConfig.DEBUG) {
              Log.w(TAG, "WARNING: Calling setFacebookDomain from non-DEBUG code.");
          }
  
          Settings.facebookDomain = facebookDomain;
      }
docs: Sets the base Facebook domain to use when making Web requests. This defaults to "facebook.com", but may
  be overridden to, e.g., "beta.facebook.com" to direct requests at a different domain. This method should
  never be called from production code.
  
  @param facebookDomain the base domain to use instead of "facebook.com"