We had a few readers suggest Signal as their favorite secure messaging system (in our item last week about Telegram).  Security boasts that they have state-of-the-art end-to-end encryption (powered by the open source Signal Protocol) which will keep your conversations secure. They say they can’t read your messages or listen to your calls, and no one else can either.  They have no ads and it’s an independent nonprofit.  www.signal.org.  How would you compare Telegram vs. Signal? What do you use?