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GitHub User: motoxtremist
@avadhbsd Use omniauth-facebook gem version 1.4.0. According to many comments elsewhere. 1.4.0 is the "most/last stable version". Some folks mentioned that certain versions of rails conflict with the omniauth-facebook gem also. See this link for more: http://stackoverflow.com/questions/13425757/rails-facebook-login-error-with-omniauth-facebook-omniauthstrategiesoauth2
@Jen Did you ever figure out why you were getting 500 internal server error when hitting /auth/facebook? I'm experiencing the same issue. Any help is appreciated!