Struggling with Communication Among System Members

For us we send out internal invites to each other to invite someone to do activities with whoever is fronting. It may be as simple as saying internally "hey, I'm gonna eat this meal, does anyone want to join me?" That's helped us a lot and allows us to feel more trusting if each other as well

How do you chat? Do you use a special app or notes or an actual text message system? I've gotten that advice from others, but I have no clue how to do it.

We text! We have our phone with us all the time and it helps to be able to look back at conversations and stuff. We also have a digital planner thing on Notion which helps a lot when we remember to use it