Nathan Ingraham:

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. “Because you have a lot of followers on Google+, only people in your circles can contact you by default,” reads the email Google sent out announcing the new feature to users with thousands of followers.

You never wanna piss off the money-makers.

Posted by Ben Brooks