(Image Author: Wikileaks)
On the 10th of November a federal judge, Liam O'Grady, upheld an order allowing federal prosecutors to access Twitter account information for Jacob Appelbaum, Rop Gonggrijp, and Birgitta Jonsdottir, due to their association with Wikileaks. The three petitioners argued (1) that their IP addresses should be considered private, and (2) that the request for information was too broad and unrelated to the federal investigation of Wikileaks.
We do not associate your IP address with any other personally identifiable information to identify you personally, except in case of violation of the Terms of Service.
Twitter cooperates with government and law enforcement officials or private parties to enforce and comply with the law. We may disclose any information about you to government or law enforcement officials or private parties as we, in our sole discretion, believe necessary or appropriate to respond to claims, legal process (including subpoenas), to protect the property and rights of Twitter or a third party, the safety of the public or any person, to prevent or stop any illegal, unethical, or legally actionable activity, or to comply with the law.
That provision, above all others in the policy, appears to be sufficient notice to remove a reasonable expectation of privacy in IP address information.