Difference between sign up with Facebook/Google/etc and log in with Facebook/Google/etc
facebook, facebook-graph-api, facebook-login, oauth-2.0
Solution
"Log in with Facebook" implies that you already have an account.
"Sign up with Facebook" means that you will create a new account.
You could have the same button for both, unless perhaps signing up required more info than just you name and email (which Facebook would give you).
Problem
I am currently trying to implement Facebook, Google and other third parties connectivity for my web application. When I browsed many webpages I noticed there are two options, take the Facebook option for example: Log in with Facebook and Sign up with Facebook. From what I could tell they both do the same thing, if you don't have a user in your database with Facebook retrieved email, the app creates one and logs you into the new account. The same can be said about Google login/signup. What would be the difference between "Log in with x" and "Sign up with x"?