What about using the blockquote format with > ?

Snippet from someone else's post by: @eapl.me

Would it not also make sense to have the repost be a reply to the original post using the (<a href="?search=twthash" class="tag">#twthash</a>), and maybe using a tag like #repost so it eaier to filter them out?

I'm also more in favor of #reposts being human readable and writable. A client might implement a bottom that posts something simple like: <a href="?search=repost" class="tag">#repost</a> Look at this cool stuff, because bla bla [alt](url)

This will then make it possible to also "repost" stuff from other platforms/protocols.

The reader part of a client, can then render a preview of the link, which we talked about would be a nice (optional) feature to have in yarnd.