Mastodont is a user on mastodon.cloud. You can follow them or interact with them if you have an account anywhere in the fediverse.
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"Mastodon broke the cardinal rule of social media: it separated them into silos" sorry @LanceUlanoff but this is not the "cardinal rule of social media". This the cardinal rule of walled gardens build to grow the product (the users) in order to sell them to advertisers. http://mashable.com/2017/04/05/mastodon-wont-survive/