Do I need a library for Codeigniter to create a Facebook application?

Do I need an entire library to crate a Facebook app with Codeigniter? I have not made an app for Faceb开发者_运维百科ook before the the developer documentation looked simiple. Beyond using my "secret" id for my app what else would I need to do to send my output via my view back to the facebook canvas? Are things more complicated than they seem? Don't I just output to my view as normal except things go to the canvas? Thanks.

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No, you do not need a library. You can make all requests to the Facebook Graph api using cURL or any other method to call urls.
However using the Facebook PHP SDK does help, it has a lot of helper methods that you'll find useful, do check this link to the documentation for the sdk, it's helpful.
Hope this answer helps you.
p.s: And yeah you just output to your view as any other web app

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No, you do not need a library, but it will make the process much smoother and take care of a lot of baseline functionality that you will need.

You might checkout my post here to see exactly how to integrate the offical facebook SDK within a codeigniter application as a stand alone library...