I saw this warning in facebook as well. Too many fake sites nowadays. This kind of sites usually appear when you search the site in google. The first one that appear is advertisement and if you don't check the URL and log in immediately, you will lose the coins in your account the moment you enter. This is the reason why I always book mark the sites that I use and access it from there always so that I can avoid using google to access the site because of this possibility. There is a case with myetherwallet as well changing the URL with special character.