Reuters reports [reuters.com] that Twitter has sued tos stop the U.S. government's effort to learn the identity of a Twitter user who has criticised that government's policies.
"The rights of free speech afforded Twitter's users and Twitter itself under the First Amendment of the U.S. Constitution include a right to disseminate such anonymous or pseudonymous political speech," Twitter said in the lawsuit.
further information:
court filing [documentcloud.org]
additional coverage: