A few days ago, Google rolled out a potentially invasive new feature — if you have both a Gmail address and Google+ account, other Google+ and Gmail users will soon be able to send messages right into your inbox, even if you never gave them your email address. By default, Google says it is letting anyone on Google+ send messages to your inbox, even if you dont have them in a circle, making the service completely opt-out rather than opt-in. For high-profile users who may have thousands of users following them, Google has decided to make the default more limited. Those users will only be able to receive messages from Google+ users that they have actively put in circles.