I quit Facebook in 2010, despite being told I'd need it to keep in contact with anyone in my life. I immediately lost contact with a small network of casual acquaintances. For friends and family, I just started texting, phoning, and emailing them. Stayed in contact just fine. I quit Instagram a few years after that and nothing of value was lost in my opinion. I've deleted and recreated a Twitter account about 7 times since 2007 because nothing else could really replace it fully.

I quit Netflix because I never watch it but immediately resubscribed because my wife was deep into Virgin River and The Great British Bake Off. woops.