Requested content of direct messages with no showing of probable cause or individualized suspicion!

That could allow the account holders to claim that the 2703(d) order is unconstitutional. (One federal appeals court recently ruled that under the Fourth Amendment, a 2703(d) order is insufficient for the contents of communications and search warrant is needed, although that decision is not binding in Virginia or San Francisco.)

I think there will be a binding precedent in those circuits forthwith.

A Twitter representative declined to comment on any specific legal requests, but told CNET: "To help users protect their rights, it's our policy to notify users about law enforcement and governmental requests for their information, unless we are prevented by law from doing so."

Buchanan's original order from last month directed Twitter not to disclose "the existence of the investigation" to anyone, but that gag order was lifted this week.

It's unclear why Buchanan changed her mind. Twitter didn't immediately respond to questions, but the most likely scenario is that its attorneys objected to the 2703(d) order on grounds that the law required that account holders be notified, and that the broad gag order was not contemplated by Congress when creating (d) orders in 1986 and could run afoul of the First Amendment.

The gag order also appears to have violated DOJ policies.