KaKao talk work similar as skype. You register to your phone number so you can't have manyID unless you have multiple phone numbers. You can make your friends by having their phone number. If you have their phone number it automatically come out in your friend list. However, more simple way is that if you search their ID you can have them on your friend list, if you add it. You can also search for people, talk in groups, and call just like skype. Also their are a thing called profile. If you click profile then you can change your profie and leave a small message. You can change it by clicking the picture and take a new picture or choosing picture from the Camera.
My ideas and thought about Kakao talk
My benefit
In my opinion, I think that Kakao talk is really comfortable and useful. You can communicate easily and when I have something to ask to my friends, I can just text him or her instantly and they can reply to me. The good thing about Kakao talk is that I don't need to visit nor call, I can just text message them . If there were no kakao talk then we needed to waste money and it would be really comfortable because there are no ways to communicate except for calling.
Societies benefit
people like employees are having benefit the most because Since businessman are busy there are no ways to communicate except for messaging. If they are talking to their mates or their boss, these days people use Kakao talk. Even if they have work or writing to do until the next day they put the writing in to Kakao talk. Also CEO such as lee gun hee uses Kakao talk because it is the fastest way to communicate with their workers.