Although Twitter is a tool for short bursts of communication, fully relying on it for emergency use could be a mistake. Following up with a back-up form of communication is a better idea.
I think that if a movie was to be made, whether it was accurate or not, it would certainly increase awareness about social networking sites on the Internet. It might encourage people to make more connections over the web. Businesses that advertise on the Internet would certainly benefit from this attention.