Can I message friends who aren’t using the Messenger app?

Yes. You can send messages to people who have Facebook and Instagram accounts but don’t have the Messenger app on their phone. They’ll be able to see your messages or calls when they log into Facebook on their computer.
Keep in mind that:
  • People who don't use the Messenger app on their phone won't be able to receive messages or calls from Instagram accounts.
  • Cross-app communication is only available on the Messenger mobile app.
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