Similar to Microsoft’s Windows Live People that's integrated with Hotmail, and allows real-time updates to contact's information. Now, Google Profiles too has a new feature that lets you share information about yourself with your contacts. "This information is not public.You control who sees it. Once you've entered your contact information here, you can share it with your friends and family, so they always have the most up-to-date information."
Source:→ Google System