The correct phrase is “Chatting on whatsapp” and not “chatting in whatsapp”. e.g. She was chatting with him till night on WhatsApp.
The correct phrase is “Chatting on whatsapp” and not “chatting in whatsapp”. e.g. She was chatting with him till night on WhatsApp.
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The correct phrase is “you on WhatsApp”. "are you in WhatsApp" is incorrect.