629
U.S. officials urge Americans to use encrypted apps amid unprecedented cyberattack
(www.nbcnews.com)
This is a most excellent place for technology news and articles.
Provided they have an open API and don't ban alternative clients, one can make something kinda similar to TOR in this system, taking from the service provider the identities and channels between them.
Meaning messages routed through a few hops over different users.
Sadly for all these services to have open APIs, there needs to be force applied. And you can't force someone far stronger than you and with the state on their side.