Open Url redirection on login with facebook

How it was found

steps to produce: 1, go to the site imgur.com and login with facebook and if you are new user then u must be asked for username on the link https://imgur.com/register/thirdparty/facebook?redirect=http://imgur.com/

nw just change the parameter redirect= value to https://google.com and hit enter and give username and click next and you will redirected to google

Regards Dipak