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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.
Note that it doesn't mean metadata is encrypted. They may not know what you sent, but they may very well know you message your mum twice a day and who your close friends are that you message often, that kinda stuff. There's a good bit you can do with metadata about messages combined with the data they gather through other services.