What about Twitter?
Maybe I'm being harsh, and the app doesn't actually want to tweet in my name, but twitter doesn't allow it to request read-only access. Still, the permissions as displayed are clearly not what I want to grant, and I don't get to veto only the update ability.
I would rather not use a service than offer it the possibility of spamming in my name, and I have made that choice a few times now.
*Unless you make tweets private. But even then, your followers and followees are still public.