Forum Academy Marketplace Showcase Pricing Features

How to differentiate between new user and vising user?

okay so in my app I have allowed users to login/signup through Facebook, Google and Twitter. Now I want to ensure that if the user is a new user i.e. is signing up for the first time then he should be taken to a different page and when an old user is logging then he should be taken to a different page.
How can this be achieved?
@NigelG

The following replies were posted to a similar question I had a while back: