The onboarding experience with Telegram is extremely easy, which is useful when dealing with non-technical audiences who might not even have a social media account (but do have smart phones).

My Bible study class has grown enough that standard SMS/MMS group texts are hitting up against Verizon's carrier limit (I think we have only two people who use Verizon), and RCS isn't an option. Telegram wasn't my first choice, but it was a lot easier for everyone, and it supports tablets out-of-the-box.