5ish – if they post the pictures in a way that states something false, it is defamation. If they take the picture and say this was taken by a antivax event, that is not defamatory and is true. If they post the picture and say the person opposed vaccination and has caused multiple death, that is defamatory, and if the person can disprove the online statement it will be clearly actionable. Knowing the social media, the latter scenario is more likely (remember not all persons photographed on the street outside the building are persons who oppose vaccination, but the social media will say so).
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