Those apps that allow log in through Facebook, such as Spotify, is there a way to get them to open the Facebook app itself rather than Safari? I don't use Safari as it's a big pile of ****, so I have to log in every time I want to authenticate a login. Why can't it simply open in the app?
If you're logged into the Facebook App, it should automatically do it (when I log in via Facebook, I see it briefly switch to it, then switch back to the app).
Also - what's wrong with Safari?