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WhatsApp, Facebook Messenger, and We Chat apps do not require any introduction. These messaging apps have become more popular than social media, and many entrepreneurs want to capitalize on their popularity. Let’s go through five formulas to make your messaging app capable of standing firm against the giants. Here are some reasons for WhatsApp's tremendous popularity- it's the first of its kind app. It's a robust, reliable, quick, and affordable alternative to SMS. It is completely free to use this app for sending and receiving messages. The biggest reason why WhatsApp has become popular is word-of-mouth publicity.