rogerd - 7:08 pm on Jul 31, 2012 (gmt 0)
One question is whether the email address was public or not. Outing private info is a no-no in most communities, and I can see Twitter taking the action it did in response to a specific complaint.
The original coverage I saw suggested that the email was easily guessable, which isn't the same as public. Similarly, if I could discover the email by detailed research but not by going to public profiles, I'd say that's not public.