I think there is less cost to being in multiple chat platforms than multiple social media platforms.

Funny, every time I've joined a new group for dancing or art classes or DnD or anything it's always 100% of the time a WhatsApp group, no questions asked. (This is in Ireland).

Never occurred to me that Americans wouldn't have a common group chat app everyone uses. Do Americans not all use iMessage, since pretty much everybody has an iPhone there?

Exactly this.

Plus the notifications for chat groups are basically:

- show me everything

- don't notify me at all

When I ran a student society we used an email mailing list.

You can have two if necessary, one only for announcements and one for discussion.

E-Mail! :)

I have Messager app fatigue at this point (where I live).

- Doctors offices and official services use SMS.

- Some of my close family and friends use Signal (on my pressure).

- The distant boomers use Facebook Messenger

- With the younger people they use Snapchat.

- Almost everyone else in the country uses Whatsapp as that's the dominant messaging app.

- My friends who live in Berlin use Telegram

- Online communities for tinkering and foss projects require Discord.

God I miss the 2000s.

Whatever the group owner picks, same as it's always been.

No one cares about the actual choice, only that it is made.