Facebook Authorization on Rails app: why do we need to do Both server and client side authorization?

The short answer is - you don't. You can choose between client side login (via javascript SDK ) and server side login using omniauth . The disadventage of server-side login is overloading the server for a call you can do from the client.

The advantage is that usually the token is longer (3 months token and not 1-2 hours like client side). I suggest combine the two . Use the client side for initial login, once you do that have an async call from the server side for extended token (only if you have to).

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