When it comes to social media photographs, it's easy to forget that every person has a legal right to prevent you from posting a photo of their face online. Paid photographers and media companies are very aware of your legal rights, and they require people to sign a model release form.
Those release forms grant ownership and permission to use the photos for any purpose, even to sell the photos or use in promotions to sell a product. A quick Google search for "sample mode...
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