Should Twitter start supporting cryptographically signed messages? In any case, I wonder about the legal ramifications of this kind of event, for Twitter and for the individuals that have been hacked.
There is no loosing in doing so: just put a padlock on verified mesages and show the signing key. If the message sounds fishy and it's not verified then you should start worrying.
We've had the technology to avoid these sort of issues for decades and it's a shame it's still largely unused. Yeah, I know the argument PGP usability is really bad but it doesn't mean Twitter or other network used as official channels can't provide their own friendly interface and start signing/verifying messages, they certainly have the resources.
