I see WhatsApp used in the US among folks with relatively large networks of international acquaintances. For those with more domestic social networks, pplain SM

I see WhatsApp used in the US among folks with relatively large networks of international acquaintances. For those with more domestic social networks, pplain SMS, iMessage, GroupMe, and Facebook Messenger seem to be more common among the general population. Signal, Telegram, Discord, and Slack are pretty prevalent with techies.