As I tweeted, it's the same with Draw Something and Facebook, a popup within the app with no signs of the url. I was under the impression that at least with twitter you could send people to the oAuth page via their default browser and then get twitter to return them to a url which the app can capture via an intent eg http://templerun.com/androidauth or templerun://signedin but as I've not bother to get past page one in Android Coding 101 I couldn't confirm.