That makes me think—why do I enjoy conversations with friends then? What's really the difference between a friend and a stranger? Friends annoy me too, maybe even more often than strangers do.

What a bizarre perspective. Have you never gotten any personal value out of a single conversation in your entire life? Have you never made a friend? I don't understand this "all conversations are bad and useless" nonsense. What on earth do you think you're doing on social media?