@prologic I say we should find a way to support mentions with only url, no nick, as per the original spec.

• For <a href="/timeline/profile?url=url">@nick</a><a href="url" class="webmention"></a> we already got support
• For <a href="/timeline/profile?url=the posting client should expand it to@<nick url">@nick></a><a href="the posting client should expand it to@<nick url" class="webmention">, if not then the reading client should just render it as@nick` with no link.
• For <a href="/timeline/profile?url=the sending client should try to expand it to@<nick url">@url></a><a href="the sending client should try to expand it to@<nick url" class="webmention">`, if not then the reading client should try to find or construct a nick base on:
  1. Look in twtxt.txt for a nick =
  2. Use (sub)domain from URL
  3. Use folder or file name from URL