Exclusive: U.S. government seeks Facebook help to wiretap Messenger - sources

"However, in cases of chat, gaming, or other internet services that are not tightly integrated with existing phone infrastructure, such as Google Hangouts, Signal and Facebook Messenger, federal regulators have not attempted to extend the eavesdropping law to cover them, said Al Gidari, a director of privacy at Stanford University Law School’s Center for Internet and Society.

“A messaging platform is excluded,” maintains Gidari, who is not involved in the Fresno case"