Google+ Invites
Google+ is rolling out a new feature that lets you invite others simply by using a link. If you Click the “invite friends” button on the right-hand side of your Google+ page and you’ll find a new link that you can IM to friends or post on the web.Keep in mind this is still in field trial, so Google is limiting sign-ups from these links to 150 per person for now. Click here for a Google+ Invite