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This permission is of moderate-high importance. This allows the
application to read what accounts you have and the usernames
associated with them. It allows the app to interact with permission
related to that account. An example would be an app that was restoring
your contact, would discover your Google account then send you to
Google's login screen. It doesn't actually get to see your password,
but it gets to work with the account. This is also legitimately used
by applications to add contacts to your accounts, such as dialer
replacements and contact managers/backup/sync/etc.
Thanks, but still a little confused. Am I right that: even if the application discovers my account (and thus knows my email address), it still needs to get my additional explicit permission to interact with my Google account (e.g. Google Reader asks for my permission on first run)? – user2722Dec 7 '11 at 3:56
1
@danteisnotaGeek It would need the "Use Credentials" permissions to actually use that account (it doesn't share your password, but an authentication token, sort of like how OAuth works on Twitter and Facebook). – Bryan Denny♦Dec 7 '11 at 6:29