This document discusses the rise of over-the-top (OTT) messaging applications and how they have disrupted traditional telecommunications companies. It analyzes popular OTT apps like WhatsApp, Facebook Messenger, LINE, WeChat, and KakaoTalk and their rapid growth in users. It also examines lesser known apps and discusses how OTT apps differentiate themselves through features or disrupt existing services by transferring value to users for free. Finally, it outlines traits of apps that focus on social affinity versus task fitness and how both approaches can achieve widespread adoption.