Well when you say common, do you mean with another application that utilizes an open API that is connected to many popular platforms and that is as widely used as Twitter?
I would guess that it's true for many APIs which rely on the user providing their password to the 3rd party application.
Of course that's the bigger problem. The user shouldn't have to give their password out. It's somewhat ironic that Twitter doesn't implement OAuth or something similar since Blaine Cook started OAuth.
Not many come to mind.