Too Long; Didn't Read
Nowadays there are literally dozens of kinds of messaging apps out there. Some of them claim to be completely secure and protected, using advanced encryption algorithms and publicly protecting the privacy of their users, which can sometimes lead to such services being <a href="https://motherboard.vice.com/en_us/article/qvx7dm/telegram-russia-protest" target="_blank">blocked</a> in certain countries (as happened to Telegram in Russia).