[rezonant]

Do you have a source that says it's 4th in the US? Because from my research that is not the case by almost any metric. And if you consider "texting" as understood by most consumers (grouping SMS, RCS, and iMessage usage together), it seems to be overwhelmingly dominant in the US.

You might wonder why you'd group those three together without including other messaging apps. There's a few factors:

- Every phone comes with a texting app. It's the one that sends text messages to phone numbers

- Within a user's texting app, the underlying technology chosen by the app (SMS, RCS, iMessage) is mostly transparent and automatic. It is not a conscious choice by the user, nor is it something the texting app goes to pains to ensure you understand. And in Apple's case, it is not an option to choose a technology for a specific conversation, you can only configure the entire app to use one technology versus another.

- End users consider it to be an overall unified platform, despite the technology mess. Consumers say "I'll text you", they don't say I'll SMS you.

[jonhohle]

I don’t have specific metrics for the US, but estimates for What’s App globally are 100B per day, Telegram 16B per day, SMS 23B per day, WeChat 45B per day, and iMessage 8.6B per day. I couldn’t find estimates for Signal, Google Chat, or Facebook Messenger.