How can I start a group conversation?

On mobile devices:

There are two ways:

1. In the conversation list, tap Contacts .
2. In the search field, type the profile name of the person you want to add, or tap their avatar.
3. Type additional names to add more people. You can create conversations with up to 128 people.
4. When you are finished creating your group, tap CREATE GROUP or Return.

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