Follow these steps to create a group on Line: How to Create a Group on Line Chat Appīefore you go ahead and join someone else’s group, you can make your own group to see what options Line group chats offer. In this article, you will learn everything you need to know about joining and creating groups on this popular social app. There are many ways to join a group on Line. You can join your groups led by your friends, but you can also find many groups on Line which are open to the public, which means that anyone with the link can become a member. You can expand your circle of friends and join various groups on the Line chat app. Line is an excellent social app because it mixes a social media platform with a messaging app.