code: private static long getLastUpdateByReplica(final Node userReplica) {
  		final Node user = NeoUtils.getNextSingleNode(userReplica,
  				SocialGraphRelationshipType.REPLICA);
  		if (user.hasProperty(Properties.User.LAST_UPDATE)) {
  			return (long) user.getProperty(Properties.User.LAST_UPDATE);
  		}
  		return 0;
  	}
docs: get a user's last recent status update's time stamp
  
  @param userReplica
  replica of the user targeted
  @return last recent status update's time stamp