Twitter's careful wording

There is a story in today's guardian: Twitter 'did not suppress student protesters' accounts'

http://www.guardian.co.uk/technology/2010/dec/01/twitter-student-protesters-accounts

I thought the quote attributed to Twitter was interesting:

We have not, and will not, do anything to stand in the way of people using Twitter for the open exchange of information. Period

It seems deliberate that they leave the possibility that they might stand in the way of people using Twitter for private or covert exchange of information. A similar form of words might be useful in the TiddlySpace terms of service.