Per the text, the screenshot you are seeing is what happens when someone links to a jsfiddle using a url shortner but posts linking directly to jsfiddle are rej

Per the text, the screenshot you are seeing is what happens when someone links to a jsfiddle using a url shortner but posts linking directly to jsfiddle are rejected. >Twitter is rejecting posts with JSFiddle URL inside. >If a URL shortener is used the unsafe page warning is displayed[1]