For anyone trying to incorporate Facebook into CodeIgniter, you probably have come across the dreaded invalid session error. In this tutorial, I show how to get past this error. Thanks to Eliot Haughlin for his Facebook CodeIgniter library, which really helped me out.
Attached to the tutorial, I have a zip file with my modified version of Elliot’s library and the latest Facebook PHP Client Library. Just drag and drop it into your web app!