I've met a few guys online who then want to Whatsapp. No prob. Happy to (but it does reveal my identity). But a lot of people chatting in dating threads here talk about the fact the guy didnt reply despite being on Whatsapp. How can you tell? I respond when I notice a message but have no idea if people are on it or off it (including me). Can someone explain? Be kind I'm old. And sometimes OLD.