The privacy setting allows you to randomize the geo-location post to within the distance set.  "0 miles" will post the exact location provided when sharing information.  This privacy setting is not disclosed when uploading information, so it can be assumed that no location is precise.

Goodreads, Facebook, and Twitter accounts can be linked here.  Once logged in, default feed integrations can be set.  You will also be able to download your library from Goodreads once you associate your account.