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Continue to ChatQuery : Depends if you mean safe as in secure, or safe as in for the benefit of your website. In theory using twitter/facebook is more likely to be secure than rolling your own registration - this https://vmapp.org/query/76715/Depends-If-You-Mean-Safe-As-In-Secure-Or-Safe-As-In-For-The-Benefit-Of-Your-Website-In-Theory-Using-Twitter-Facebook-Is-More-Likely-To-Be-Secure-Than-Rolling-Your-Own-Registration-This/