Messenger
messenger.comFacebook's standalone messaging service. If someone is on Facebook, you can reach them here, from any browser.
Instant Messaging: The Best Websites
Signal
signal.orgThe gold standard for private messaging, run by a nonprofit. The encryption protocol other apps borrow started here.
Slack
slack.comThe workplace messaging standard: channels, threads and app integrations that replaced internal email for millions of teams.
Telegram
telegram.orgFast cloud-based messaging with huge group channels, bots and no attachment size anxiety. Nearly a billion users.
The most used messaging app on Earth, with over two billion users. End-to-end encrypted texts, calls and groups; the default way much of the world communicates.
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