Consider this: everything you learn about your friends through Facebook, you weren't important enough to be reached out to personally about. THEREFORE! You shouldn't even know those things.
Interesting take.
One thing I struggle with is a diverse set of interests that practically nobody in my life shares with me. A common denominator for these interests is that most were/are cultivated by online content. There is a pervasive feeling of loneliness throughout my life, and I can't help but view the internet with suspicion as a possible threat vector to my sanity. I stay engaged here on HN, but I don't have any real friends here. All of my friends are hundreds or thousands of miles away, and I can count them all on one hand. Facebook and other attention-capitalizing networks provide an empty nicotine-buzz mimicing the real social interactions that I probably need. The idea that social media is toxic isn't new, but I guess lately that truth has been resonating deeper within me.
Not that different from talking here, except that my FB friends (and especially my FB friends with FB's learned weighting of how interested I am in what each posts) are on average more likely to be interested in the same things I am and have more similar preferences around conversational norms.
That's not to mention that people use social media as a substitute for personally reaching out to friends.