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Child Advocates Back Surgeon General's Call for Tobacco-Like Warnings on Social Media
(www.commondreams.org)
This is a most excellent place for technology news and articles.
Warnings probably work better on products you're putting in your body. If you have blackened lungs on the cigarette packaging I can't imagine choosing to smoke.
On social media, you basically have to destroy my experience for me to stop using it in the same way. All effective options are terrible: ads, microtransactions, auto-playing unexpected sounds, nonresponsive interfaces.