I have seen a lot of apps using sign in with Facebook, some apps using log in with Facebook and some apps using sign up with Facebook which the form is filled with Facebook data.
So what will be the pattern difference while using any of these?
Will be any collision between custom sign up and log in with Facebook users?
Or is it better if sign up is only based on custom sign up and then we ask users to connect social accounts? So in this case we generate only one user id.