Yes. I did it for the privacy issues, and for being personally opposed to advertising in all forms. But I also did it because social networks are harmful even beside that. They are attention suckers, they distract, and they also depress and mislead you. All in all, I feel measurably worse for having them in my life. I feel it was doing me harm, to my mental health, my free time, my overall well-being. The (small) benefits, which I can mostly replace with messaging via other services, do not outweigh this harm. That's why all the posts about "an open-source/distributed/decentralised facebook substitute" don't really appeal to me either.