For anyone who hasn't got a twitter account or just wants to give their support staff a bit more workload, Icann's direct contact message form can by found:
http://www.icann.org/en/contact/
Again this will only take a couple of minutes.
Icann are the same as any business. Adult created shitloads of revenue for Icann through the adult registrations of tld's such as the .com, .net etc etc. If they thought people will rebel over the extention in the coming years it may give them a little rethink!