Social Networks are becoming consistently more advanced, with practical features for communication, like Google Plus Hangouts, communities, Maps , events, Calendar, Youtube & Google Docs Sharing etc...
In Google Plus you can create a Personal or Business Page and then connect to/from your Google Site.
Once you have a Google Plus Profile , you can add a Google Plus Profile widget directly in Google Sites Sidebar.
In Google Sites...
Manage Site > Site Layout > Button: "Add Sidebar Item"
This will create a Link with a Hover - Google Plus profile widget. This will only be linked to the active Google Account used for the active Google Site.
You can also create this widget manually by using a
Replace the User ID (uid) parameter that is in your Google Plus Profile URL.
Any Changes you make within Google Plus will be dynamically updated in your Google Plus Widget.
ie. Profile Image, links, Google Talk/Google+ Hangout status etc..