30-04-15' bystander effect in group chat

Sometimes its ironic to see people always busy texting on the phone and you start wondering who the message is for. Because when you texted in a group chat and no one replies. In a rational chain of thoughts, it could be the bystander effects and distribution of responsibilities, i.e, wait for others to reply, or at least one person reply so I don't need to. In emotional terms, maybe you're too insignificant to them and they don't see the need to reply, or the question is too deep and they need more than a day to think through, or simply the replied text vanished halfway through the network. It makes me feel dumb talking to myself.