Short / Instant / Mobile messaging apps compete fiercely. It has about 5 year history and has a numerous players (e.g., WhatsApp, Line, Wechat, QQ, and Kakao Talk, Snpachat, Telegram, and Viber, to name a few). Some focus on simple communication and others provide interesting features including stickers and animated figures.
I visited YongPyong ski resort recently and learned how popular mobile messaging apps (MMA) are among young Asians. Tourists who are staying over Seoul and want to have a one-day trip to this ski resort can book their round-way bus tickets via four MMA including QQ and Wechat (for Chinese), and WhatsApp and Kakao Talk (for English).