Although the majority of Google’s iOS apps require users to sign into a single Google account used across its services, up until now each app required users to enter their account info when when launching for the first time. That means logging into one app will automatically log you into the other without having to re-enter your account and password. Following an update to version 2.0 for the YouTube iOS app yesterday, users have noticed that Google appears to have turned on shared account logins for at least YouTube and the recently released AdSense app.