How can I start a group conversation?

On mobile devices:

1. In the conversation list, tap People .
2. Tap Create group  .
3. Name the group, e.g. Team meeting.
4. Tap NEXT.
5. Select people to add to the group. 
6. Tap CREATE.

You can have a group conversation with up to 500 people.

Or, you can add people to an existing 1:1 conversation.