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Meta’s new AI image generator was trained on 1.1 billion Instagram and Facebook photos
(arstechnica.com)
This is a most excellent place for technology news and articles.
I would usually try to add things to the prompt you'd expect to find in a more casual scenario, like "smartphone" with half weight or something, or "video", or maybe like "Facebook". Just meta information you think attaches to more casual photos. Maybe even add "photo".