If you accidentally hit the link, change your password immediately before the hacker can hack into your account. The link actually sends your username and your password to the hacker's database because the site's security is trash and the site was compromised.
the dude asks the person to link a random alt to their main account. there's no hacking here, just ignorance/stupidity
after the guy got 1 account, he managed to convince the friends of that account to share their password through PM. so he got more accounts and it spread like a virus. why people think sharing sensitive info through PM and not skype is a good idea i don't know but people will be people