The link button in the post editor incorrectly escapes square brackets in inline code.
Write the following MarkDown in the editor
text text `function` text text
`function`, press the link button (), and enter some link
the result will be
[`function\[\]`]which renders as
This is a minor thing, as it's easy to manually remove the backslashes, but it's somewhat annoying so I thought I'd mention it.
Edit by Mr.Wizard
It is September 2013 and this still hasn't been fixed. While "adding
 after it" is not presently the custom on Mathematica.SE this is still a bug and still needs to be fixed.