mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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Anton Piatek

@neil given users of adult content site are most likely to use email aliases or unique addresses, I'm not sure how validating a unique email address is going to produce an age estimate. I guess +aliasing is easy to strip off, and maybe domain wildcard emails are not that common?