But you could have users log into your site and then act as tumblre. If they already OK'd the tumblr app, they would never know. Otherwise they'd just have to

But you could have users log into your site and then act as tumblre. If they already OK'd the tumblr app, they would never know. Otherwise they'd just have to ignore the screen saying what App you're OKing (and most people, I'd wager, would, and just think you were using tumblr for something). right?