The US Department of Justice has served Twitter with a 2703(d) court order to reveal information about accounts related to people associated with WikiLeaks.
The order is a request for account data including the ominous "correspondence and notes of record related to the account" for users Jacob Appelbaum (@ioerror), Rop Gongrijp (@rop_g), Birgitta Jonsittir (@birgittaj); Julian Assange and Bradley Manning from November 1, 2009 to present.
Requesting the order to be unsealed is an interesting move by Twitter in the for all intents and purposes legally unprecedented case of the stateless WikiLeaks. Twitter has heretofore been subpoenaed for information by Pennsylvania Attorney General Tom Corbett, a subpoena that was subsequently withdrawn.
The WikiLeaks Twitter account has mentioned Google and Facebook as other possible recipients of data requests.
Here's the court order and unsealing notice: