I always hold up https://pinboard.in/ as a poster child for a successful one-man shop. It's so successful he takes several months off at a time, right now he's in HK reporting on the demonstrations.
I quit Facebook right around the time my son was born. It wasn't for privacy reasons (and frankly, it never bothered me), but rather for the enormous energy and time sink it had become. Truly, it was as if I was a dopamine junkie and Facebook was the pusher of those sweet, sweet red circles with a number in them that meant someone, somewhere vaguely agreed with something you posted. I noticed I was not present in the moment with my newborn son, but rather my brain was hunting for the next quip to post or cute/smug/humblebragish picture to upload.
I quit cold turkey and have never looked back.
I'm off all social media today (except LinkedIn) and have weeded out a lot "friends" who really were just co-enablers in the dopamine rush hunt.