I don't think it's that Facebook itself is inherently toxic. Like drugs it can indeed be a useful tool but only when used correctly and moderation being key. I only use Facebook myself to communicate with people I need to communicate with and to share motivational/advice type stuff with those who are a part of my life. But it stops there. I do my best to always remain mindful of what I'm doing if I am on Facebook. If I find myself scrolling at all in an unhealthy manner I will exit and turn the app off for the time being. But yes the vast majority of the population would find dramatic increases to their mental health after cessation of use of Facebook entirely. Facebook and even phones themselves have before and still do/are forms of addiction in my experience. That's coming from my perspective tho as a recovered poly substance addict and recovered heroin fentanyl addict of 5ish years and have been sober for 3 this spring.