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In the Line social network, you can use private chat, as well as public ones in order to keep in touch with your friends.
All you need to have a group chat in line is follow these steps.
For having a public chat, first you need to create a group.
Go to the main page of the app (Friends) and click on the specified option shown in the screenshot below.
Now you can pick a name and a photo for your group (marked in blue),
Invite the people you want to have a chat with (red),
And then create the group (green).