Yes. It mentions compliance with the U.S.-E.U. and U.S.-Swiss Safe Harbor Privacy Principles of notice, choice, onward transfer, security, data integrity, access, and enforcement.
Twitter may share or disclose information at user’s direction, such as when user authorizes a third-party web client or application to access their Twitter account. Further, the company may share private personal information with service providers subject to confidentiality obligations.
Twitter may also preserve or disclose user’s information if Twitter believes that it is necessary to comply with a law, regulation or legal request; to protect the safety of any person; to address fraud, security or technical issues; or to protect Twitter’s rights or property.
Information may be transferred or sold as part of Twitter’s involvement in a bankruptcy, merger, acquisition, reorganization or sale, and the company may share or disclose non-private, aggregated or otherwise non-PII.
Yes: May 17, 2012. Link to archive of previous privacy policies provided.