I’m not sure how much research you’ve done, but a quick search of “Facebook addiction peer reviewed” shows plenty of results for science backed research into Facebook addiction and the negative impact of being chronically online/on social media.
It’s also probably worth digging into dark patterns used by Facebook and others to keep users coming back/focused on their feed.
I’d also be prepared for the counter argument: “governments are only using Facebook because that’s where the people are”.
The phrase you’re looking for is “X-rated pedophile hellscape”.
https://bhr.stern.nyu.edu/quick-take/a-new-report-alleges-that-roblox-remains-an-x-rated-pedophile-hellscape-and-what-this-says-about-the-need-for-regulation/