I have roughly 70-80 social media friends, discounting Twitter which I don't engage with my friends at all but instead engage with other computer science, mathematics, physics and beer enthusiasts. These are people having similar interests to me, but they're not my friends. Sort of like HN - you can think of HN as a professional community where we all have like interests, but we're not friends. Like this conversation, we're just strangers who've met and are talking for a brief moment.