LINE definitely adds another dimension to the game, and is a fantastic source of information.
The chatrooms on LINE are created by users inviting others to a group chat. You can't therefore simply download LINE and search for them. You need to have a username from someone in a group, they need to 'add' you as a contact, then they can invite you to the chat group/room. It's in the bigger rooms that you might be able to find someone from the opposing squad.
HQ 10 - Sons of Death
You must do what you think is right, of course.