Technically he was suspended from Twitter for tweeting the email address of NBC exec Gary Zenkel.
http://www.reuters.com/article/2012/07/30/us-twitter-nbc-jou...
* This is actually not directly from the ToS, but a Twitter support page which serves to clarify the part of the ToS which states this.
This is the same NBC that cancelled Star Trek, they clearly have not learned how to handle social interactions and feedback still from there customers and potentual customers.
I was under the impression that non-business e-mails, phone numbers and addresses were considered private, but anything related to a business was fair game.
There is no way you can go the media company route (vs. the api/infrastructure route) and not get this conflict.
It'd be better to take a look at things like status.net, or more low level solutions such as http://scripting.com/stories/2012/07/25/anOpenTwitterlikeEco....
It's a corporate business address, which makes it as socially acceptable as "send all your complaints to NBC c/o Gary Zenkel", and not against Twitter's policy.
I think it's arguable whether his work address is "personal information" or not.
EDIT LoganCale points out that I am wrong. He's right.
"If information was previously posted or displayed elsewhere on the Internet prior to being put on Twitter, it is not a violation of this policy."
It's an email owned by a public company, that's about as public as you get.