Use JSFiddle to share Javascript problems

So online compilation is improving, during my travels I have seen online Javascript editing environments, for example there is JSFiddle (screenshot below).  Here is a specific Angular.js example

One can see the page is divided into 4 quadrants, HTML, CSS, JAVASCRIPT and resulting output. One can play aropund and experiment and if you get stuck then you can use it as a link in a StackOverflow question and gets some help. A truly useful online collaboration tool. However, questions could be asked about the intellectual property rights so I would advise limiting to learning concepts.