@boris @blaine @snarfed.org we have a long-form text FEP that Threads, Mastodon, Write Freely, WordPress, and Ghost all support. It was developed collaboratively by these teams. `preview` is a compromise for Twitter-like services that don't want to assemble a representation out of the Article properties.
https://codeberg.org/fediverse/fep/src/branch/main/fep/b2b8/fep-b2b8.md