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in my case, I think silence is due to the gender differences of those present in the chat. I am a hetero, and I am stupidly not interested in the bi and gay community (by the way, why they are present in the hetero section of the site is a big question).... also, some people are introverts ...
In my experience, it's better to write to people you like in person, and in chat with private messages ... (I'm also good at communicating in video chat)