“Already invited? We’ve temporarily exceeded our capacity. Please try again soon.”
“Google+ is in limited Field Trial Right now, we’re testing with a small number of people, but it won’t be long before the Google+ project is ready for everyone. Leave us your email address and we’ll make sure you’re the first to know when we’re ready to invite more people.”
If you’ve been invited to Google Plus and are receiving one of the above messages, don’t worry. Google is only allowing a certain amount of people to join at a time right now.
Once the queue is filled for a particular block of time, they put new sign ups on hold even if you’ve been invited. This is only a temporary hold and within the next couple hours you should be able to use your invite and start using Google +!
Google+ Limited Release Notification Screenshots:
If you’ve already joined and want to learn how to add or invite your friends, check out my article How To Invite Friends to Google Plus Social Network.
To learn about privacy settings in Google+, take a look at Managing, Editing and Changing Google Plus Privacy Settings.