Mastodon might struggle to comply with social media age verification laws

1 September 2025

The Mastodon 4.4 release in July 2025 added the ability to specify a minimum age for sign-up and other legal features for handling terms of service, partly in response to increased regulation around these areas. The new feature allows server administrators to check users’ ages during sign-up, but the age-check data is not stored. That means individual server owners have to decide for themselves if they believe an age verification component is a necessary addition.

Mastodon is a decentralised social network that allows anyone with the inclination, and access to a reasonably robust server, to establish their own instance, or chapter.

Mastodon is the sum of its many parts, and is not structured like X or Threads, whose operations are run from a single, centralised, point. I have no idea how many Mastodon instances there are, but the number would not be insignificant.

Compliance with age verification laws will be down to individual instance administrators. It’s not something the Mastodon head office could do, because there isn’t one, as such.

This doesn’t mean members of Mastodon instances operating in jurisdictions where age verification laws apply, will be able to forgo confirming their age. Indeed, age verification will be a necessity if the instance they belong to is to continue operating.