I have followed advice that seems to be working for others when trying to get SSO to work when Facebook app is also installed on device but I am still unable to get it to work.(The app loads but the Facebook login dialog disappears instantly.) I have a valid hash key generated from this OSX terminal command which I also have given to Facebook. but it isn't working as it seems to be for others.
keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64
thanks!