From Christopher Soghian’s thoughts on the DOJ’s court order asking Twitter to provide account info pertaining to users associated with WikiLeaks:

…Twitter has gone out of its way to fight for its users privacy. The company went to court, and was successful in asking the judge to unseal the order (something it is not required to do), and then promptly notified its users, so that they could seek to quash the order. Twitter could have quite easily compiled with the order, and would have had zero legal liability for doing so. In fact, many other Internet companies routinely hand over their users’ data in response to government requests, and never take steps to either have the orders unsealed, or give their users notice and thus an opportunity to fight the order.