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This should be solved by commit 1726658 but it seems is not:
Issuing a Facebooker2.oauth2 on the rails console returns false (with facebooker2 (0.0.14)) when oauth setting is NOT set in facebooker.yml, so it seems that it doesn't really defaults to oauth2.
It's possible that this code in self.configuration=(hash) of facebooker2.rb overwrites the oauth2 variable when it's NOT set in the config file?
self.oauth2 = hash[:oauth2].blank? ? false : true
Thanks! I just fixed this.