"Social media affects mental health." (Too vague, obvious.) Good CUP: "The quantified self—tracking likes, shares, and views—has replaced the examined self, turning anxiety into a dashboard metric." (Specific, surprising, arguable.)
If they lean in, you've succeeded. If they check their phone, you've failed. MasterClass
Now go write something too long for Twitter, too weird for LinkedIn, and too true for anyone to ignore. "Social media affects mental health