See this answer for example:
The link leads to http://jsfiddle.net/PcANy/6/ and it's quite obvious the user first tried to post with original link, got blocked due to not posting code so decided to go around the block.
What should we do about it? Some options:
- Crawl URL shortcuts and if leading to jsfiddle treat as such e.g. block when no code is there.
- Fix ourselves i.e. change the link manually and add relevant code.
- Leave comment to the user who did it explaining it's wrong.