The Twitter Rules state "Privacy: You may not publish or post other people's private and confidential information, such as credit card numbers, street address or Social Security/National Identity numbers, without their express authorization and permission."

The lines are a little blurred when they consider an executive's email address which is already on a public website to be private or confidential contact information.

On the other hand, Twitter probably decided that suspending one user rather than upsetting NBC was an okay trade off. That appears to have been a miscalculation.

I doubt Twitter will suffer very long for it.