Thanks! If it’s indeed as simple as “log in with facebook credentials”, that might be ok (though I suspect many members have no clue what their facebook credentials are… workaround would be if Discourse allows logging in through a notification in the app rather than username and password).
I actually used Facebook login myself when I signed up here (meta), but I can’t remember how it went.
I do know that when I created a Discourse ID and then wanted to “switch” to it, I hit a few snags.
Will test all this 