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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There seems to be an issue with gifs on right now. When I add a static gif-file on mastodon.social (running on 4.4.0-alpha) then other versions of mastodon (4.3.2 I tried) seem to interpret it as an animated gif.

This also seems to affect at least pixelfed.