No, they're OK, since subdomains are not harmful to SEO, if you act adequately and avoid doing what you shouldn't do) For instance, if you spam via a subdomain, not only it will be blocked, under the ban will fall and the root domain.
the most popular options are your choice: instagram, tiktok, facebook. they're versatile and fit all, but you've to take into account the rules of the particular platform. And it also depends on the desired TA
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