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Prevent posts with links to jsfiddle and no code

It's extremely common for people to ask and answer questions with no code other than a link to http://jsfiddle.net or similar service. These of course are not appropriate. I have personally been unable to access jsfiddle for hours due to the site being down while browsing Stack Overflow.

In an effort to help educate people on why this is a bad idea and at the same time improve posts on SO, I suggest some measures be put in place to prevent it from happening.

For example, if the question or answer has:

...prevent it from being posted, with a message or link explaining why. There may be edge cases where it does make sense, so perhaps we'd need to allow the user to click through the message and post anyways, but at least they will have been warned/educated.

If we need to discuss whether or not "link only, no code" posts are problematic and not appropriate, then so be it - but I think it's obvious and that topic has been well covered. Is there anything we can do to prevent them and encourage people to put their code in their post?

This issue is very specific to jsfiddle, I would like to see something that directly addresses that. If another site becomes the defacto code demo site, then we can cross that bridge when we get to it or look for more general solutions to this ever growing problem. I think that awareness of the issue is key to preventing it, and people don't read the FAQ nearly enough as it is - we need some direct intervention.

According to the owner/creator of jsfiddle, Stack Overflow makes up 30% of all referrals. That's a huge amount. Sure they aren't all "link only" posts, but I want to emphasize how much SO is using jsfiddle in particular to dump their code.

People aren't doing this to harm the site, the usually think they are helping out by making their post easier to read. They need to understand why this is actually a problem, and why relevant code must be posted on the site, not somewhere else. If more people understood, I think the problem would start to go away on it's own - but we'd still need something to deal with newer users who aren't familiar with the rules and goals of SO and Stack Exchange, don't hang out in meta, don't read the FAQ, etc. However, the less examples of jsfiddle-link-only posts there are, the less people will imitate them.

I honestly think that if people understood the problem more, it wouldn't be as much of an issue. This doesn't mean blocking jsfiddle, but preventing posts that rely on links to it. A lot of people are confused about that, and ask me "Since when is jsfiddle not allowed?". It's allowed, but your post should hold up without the link. People need to understand that - a warning message would probably be enough.

I do not feel that this specific issue is "status-completed". I think it's still a major problem that's bound to get worse as the months and years go by.

Here are some examples from the past few hours, as of 2012/10/17 6:45 PM EST:

These were ridiculously easy to find (took me about 3-4 minutes). I don't think the recent change has done very much to help the situatuion. There are literally entire threads on SO that are just passing jsfiddle links back and forth, and it's been like that for a long time - and bound to continue unless something is done to address this specific issue.

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