Go to http://stacksnippets.net/ or click "Run code snippet" in a stack snippet.
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.
I tried connecting with different browsers and devices in my network, and it didn't work.
Then I tried connecting to http://stacksnippets.net using a proxy, and it worked.
So I changed the public IP of my router, and it worked.
My old IP was 188.8.131.52. I hope it won't be assigned to any stackexchange user.
The same problem was asked in meta.stackoverflow.com.
Sorry about this folks. We're doing some server upgrades this week (see: #SnowOps hashtag on Twitter) and we're pretty sure we accidentally took down the Stack Snippet server temporarily. The odd part is that, while we had monitoring on it, nothing was fired or triggered so we didn't know it was down. It should be back now, and you'd guess correctly if your assumption is that I'm double checking the error monitoring on it now. ;)