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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@fediforum Peertube seems to use proportion 6:1, while Mastodon uses 3:1

You can do something like 1800x300 pixels, but put the main info in the middle half, 900 pixels wide.