Virtapay wants your facebook login..

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I have a virtapay account it has a good amount of money in that account.. recently it is asking to login to the virtapay using the facebook account.. I am not sure about this.. well I mean I am not sure about sharing my facebook login with virtapay as it is not confirmed that the site is not a scam... Is anyone using virtapay and logging in using facebook?... Do you think this is safe to do?.. please share your views.. Thanks..