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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Simon Pieters

@adactio in general, using features before they ship in a browser isn't a great idea since it can poison the feature with legacy content that might break when the feature is enabled. This has happened several times and renames or so were needed.