So Tumblr added @-mentions not too long ago.

Here’s what you type into the WYSIWYG editor:

@abandonmentprobability

It gets displayed as:

abandonmentprobability

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.