social.coop is one of the many independent Mastodon servers you can use to participate in the fediverse.
A Fediverse instance for people interested in cooperative and collective projects. If you are interested in joining our community, please apply at https://join.social.coop/registration-form.html.
@cwebber yeah, having run SD instances at two news orgs, I can imagine why they stopped supporting it (and why their website isn't fully updated). fwiw this directory seems up to date: https://securedrop.org/directory/