In Canada, the CBC might be the kind of entity to help run / coordinate “public service social media” as described in this Tech Policy Press article https://www.techpolicy.press/public-service-social-media-as-a-democratic-safeguard/

With interoperable standards and options for hosting, this could be a mix of shared infrastructure (& moderation) as well as individual orgs like Gander https://gandersocial.ca and #CoSocialCa