public function unlike($uid) {
	  // check passed data
	  if(!is_string($uid)) {
	    // bad data passed
		  throw new LinkedInException('LinkedIn->unlike(): bad data passed, $uid must be of type string.');
	  }
    
    // construct the xml data
		$data = '<?xml version="1.0" encoding="UTF-8"?>
		         <is-liked>false</is-liked>';
		
		// send request
    $query    = self::_URL_API . '/v1/people/~/network/updates/key=' . $uid . '/is-liked';
    $response = $this->fetch('PUT', $query, $data);
    
  	/**
	   * Check for successful request (a 201 response from LinkedIn server) 
	   * per the documentation linked in method comments above.
	   */ 
    return $this->checkResponse(201, $response);
	}