Ok, so.
Tweets look really good when you send them in Messages on iOS/macOS. Mastodon posts… don’t. So I built a little tool that makes them much nicer to look at:
Add ?to={any Mastodon post URL} to the end of that domain and when you send it to a friend, you get the nice looking preview. Of course the page makes it easy to paste a URL in. And there’s a Shortcut to make it even easier on iOS or macOS.
Squarespace have figured out the secret sauce for this. If you message this to yourself, you’ll get a proper preview. They basically spam all the headers.
It’s in their pages when you make a squarespace site too and works a treat.