sign in or sign up should be done in Birdie itself

[swizzle]

As Birdie uses webkit to display twitter informations there is no need for a web browser.
I mean the sign in or sign up could be done in Birdie itself without opening a dialog or switching to a browser.
After signing in/up in Birdie the user would be immediately logged in.

[vasco (vasco-m-nunes)]

A dialog is needed on the first login to get the user tokens from twitter service. Sign up process must follow Twitter's API guidelines.

[swizzle (el-ferreira-deactivatedaccount)]

Strange that an internal WebKit browser can't be integrated to do the same thing as a dialog.
However the sign up/sign in should be rethought when elementary OS supports Web/social accounts.