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Mattermost is to Twitter as TotalJS is to Slack.

From the title of their home page: "Mattermost -- Open source, private cloud Slack-alternative ..."

Why you compare mattermost to twitter ?

Argh! I'm sorry. I just realised I typed 'Mattermost' rather than 'Mastodon'!

I meant: "Mastodon is to Twitter as TotalJS is to Slack".

:)