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Is there an equivalent to "small claims court" in Colombia where you don't need a lawyer if you're willing to do your own research? Maybe threaten to take them to that court for disclosing private information without permission, and also for libel if they accompanied the photo with untruthful badmouthing. And then take them to that court if they ignore you? IANAL though, and I know nothing about what's legal or not in Colombia.

One other thing you can try is get more people to report that post. Maybe there's a threshold at which they will look into this more seriously.