X (Formerly Twitter): XSS in original referrer after follow

Hey hi, There is a XSS in the intent functionality , Steps to reproduce ======================= 1 copy paste the following Link https://twitter.com/intent/favorite/complete?tweetid=572435913768366080&alreadyfavorited=false&originalreferer=javascript:alert%281%29; 2 Click follow 3 now click return...