I tried to implement FB login using the Opa's facebook api. I cloned the example code https://github.com/winbomb/opapackt/blob/master/liveroom/src/login.opa , but it doesn't work. I can get to the point where FB redirects to http://localhost:8080/connect?code=something after authentication, but FBA.get_token_raw(data, redirect) returns opa_data_error [OPA]Error in data.
Maybe the FB api changed in the meantime?