>but thanks to broadcast updates on social media, your friends already know what have you've been up to, so they can delude themselves into thinking that they've maintained a relationship because they know superficial details.

I don't think this is really a big deal. "hey I saw you posted pictures from your trip. How was it" there, conversation started. Social media posts are basically all conversation starters.

Assuming you can even remember. I pretty quickly forget people's posts and updates.