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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active users

adb

Attention ArcaneChat users the new release has experimental Communities support, if you want to test the communities feature and join a fully anonymous public community, write to me in private in ArcaneChat, the invitation link to chat with me is in my mastodon profile

DeltaLab

@adbenitez are these like Telegram communities or Discord/Slack servers? Also can this be ported back into DeltaChat?

@abolisyonista it is just a shared profile, there is not intention to add this to official for now, also the use case is more suited for teams, like sharing a support account so several people can reply to requests, because people share a common inbox, it is not suited for open communities, since anyone can delete messages from the inbox and you can NOT ban trolls, might work for small private community of trusted people that know each other IRL