Referencing: http://fsprojects.github.io/FSharp.Data.Toolbox/TwitterProvider.html
When building a F# console application (as opposed to FSI) application-only authentication works just fine.
However
let connector = Twitter.Authenticate(key, secret)
fails with:
System.Threading.ThreadStateException was unhandled
Message: An unhandled exception of type 'System.Threading.ThreadStateException' occurred in System.Windows.Forms.dll
Additional information: ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment.