filter allowing visitors to ban texts from the electronic display. Thus the public became its own filter, preventing derogatory remarks from featuring.
Since the launch of the Tunnel Journal (http://bit.ly/i3zk5G), web-based crowdsourcing has slowly gained momentum. Crowdsourcing projects of massive scale have been launched in recent years. This has been possible because of the tools internet connectivity offers for forming and managing large and diverse crowds, often in short time frames.