So Tumblr added @-mentions not too long ago.
Here’s what you type into the WYSIWYG editor:
@abandonmentprobability
It gets displayed as:
If you switch to HTML mode, the markup looks like (without newlines):
<a class="tumblelog">
abandonmentprobability
</a>
Unless you save the post first, in which case you get:
<a class="tumblelog" href="http://tmblr.co/msgaYTlPKdo0sLlHh4mXlOg">
abandonmentprobability
</a>
If you try to use an @-mention in plain text or Markdown mode, meanwhile, the resulting markup is:
@abandonmentprobability
Notice anything missing? To get a proper link, you actually have to use (again, sans newlines):
<a class="tumblelog">
abandonmentprobability
</a>
But be careful when you try to quote that markup in your post, because if you don’t escape it somehow, it’ll get transformed into:
<a class="tumblelog" href="http://tmblr.co/msgaYTlPKdo0sLlHh4mXlOg">
abandonmentprobability
</a>
Even in the middle of an indented Markdown code block.
Seriously, get it together, guys.