How do you Group FaceTime?
One-on-one FaceTime works well, but it took Apple a while to figure out how to make it work with groups. The relatively new Group FaceTime feature lets you virtually hang with your friends fairly seamlessly.
The easiest way to start a Group FaceTime call is to open an existing group chat in the Messages app, tap on the group of contacts you're talking to at the top of the screen, then hit the FaceTime icon. This will add everyone in the group chat to the video call. If you need to add others from there, just swipe up, tap "Add Person" and enter their info.
If you want to leave the call, hit the red button towards the bottom-right of the screen. You can even leave, then rejoin the call if it's still going, which could be useful if you need to do something on your end for a moment and temporarily can't talk. To rejoin, just go back to the group chat in the Messages app and tap the button among the messages to call back in. and -- boom -- you're with everyone as if you'd never left. The above video from Apple shows how this looks.
Wait, so how many people can FaceTime at once?
Apple currently caps Group FaceTime calls at 32 people, which is... a lot of people! You can likely include your close family, extended family, and even a few friends should you need to and it'll work. But that doesn't mean it'll be a calm and orderly experience free of people trying to talk over one another, so maybe maxing out the call isn't a great idea if you're just hoping to hang out for a bit.
Can you Group FaceTime on a Mac?
You can also Group FaceTime from your MacBook or Mac desktop computer, but you'll need macOS Mojave 10.14.3 or later for it to work. To make a call, you'll open up your FaceTime app, search for the phone numbers or email addresses you wanna add, and click call -- whether you opt for video or audio is up to you.