The Financial Conduct Authority (FCA) said the move was part of an international crackdown, which has led to three arrests in the UK.
So-called finfluencers can legitimately give financial tips on social media to large audiences, but sometimes this can stray into illegal financial advice.
Regulators across across the UK, Australia, Canada, Hong Kong, Italy and the United Arab Emirates were involved in the crackdown during the week.
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Could this be jealous protection of insider information being sold as altruistic protection of the public.