For younger friends, I found that they can sometimes install a 2nd messenger, depending on how close you are. Of course, if they already use 2 or 3, you might n

For younger friends, I found that they can sometimes install a 2nd messenger, depending on how close you are. Of course, if they already use 2 or 3, you might need to use one that they have. I would suggest to check if they use Telegram/Line/Kakao/Hangouts, or suggest it to them. They are all closed source, but at least is the lesser evil?