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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@reiver ⊼ (Charles) :batman:

Previews in ActivityPub / ActivityStreams is what should bind the disparate software and user-experiences on the Fediverse.

Not the ActivityStreams 'Note'.

...

Previews using 'icon', 'image', 'name', 'summary', etc.