+1 for Discord. Discords onboarding is fantasticly simple. Simply click the big + on the left, click Create Server or Join Server. Create Server makes a new one in the region you want. Click Invite People to get a link to share out. Done in 3 clicks. Other people click that link to join the server, and are only asked to choose a username if they've never used it before. Click, type, click, joined
@Cut Garnet Games, Discord is open to everyone, you just type in what you want to be called. Creating account is 100% optional is is not mandatory to use discord. You just need to share the chat group invite link.