I want to send an email to the user when she signs up. So I mean, only when it is the first time this person is logging on the app. The only sign up way is Facebook. The command is Signup/ Login with a social Network. So the workflow is the same whether the person is signing up or logging in. Is it possible to get the first time of Signup/ Login with a social Network for a user?
You can set a field on the user object “not first time” and you turn it on after the first sign up, and the use a condition on the workflow.