title: Using MixPanel alias in Facebook and Google login
body: <p>I'm implementing MixPanel Profile identification in a web app which implements Facebook and Google login. According to the following link <a href="https://mixpanel.com/help/questions/articles/how-should-i-handle-my-user-identity-with-the-mixpanel-javascript-library" rel="nofollow">how should I handle my user identity with the mixpanel javascript</a> the <code>.alias()</code> method has to be called only once in the during the signup procedure. During the login procedure we need to call identify. My problem come when I have Facebook and Google login. In that case there is no signup procedure. So when the auth return successfully, what should I use? <code>alias()</code> or <code>identify()</code>?</p>