Insert the Google+ [Google Plus] +1 button into any Google Site.
The Google+ +1 button adds your Google site to Google+ , you also can share the website directly from the Google Menu or the Google +1 button itself.
Insert Google +1 onto a Google Sites page
Edit Page >Insert [Menu] > +1 Button
Choose the Size of your Google +1 button
and optional counters.
When you click the following buttons , the active page will be added to Google+ in the +1s tab.
Once you have +1'd an active page, you can then Share that webpage within your Google+ Circles directly from the original website.
[The Active Page will be automatically be linked below]
Then click 'Share' to add to your Google +.
You can always modify or delete a Shared item in Google + Circles and control what Circles the Shared item is visible in.
ie. A Sidebar Image, as it would be the right size and ratio for displaying in image searches also.
[Example: QRcode for mobile.goopal.org]
Once you have +1'd an active page, an image is also automatically used from that page.
When you +1 this page the 'QR' code (Sidebar image) image is used in your Google+ >profile>+1's.
Same also applies to Google+ Circles. Images, Videos Maps and other media are visible when shared through Google+.
Add a large enough image to each page or the Google sidebar for a general image, some logos may be too small.
You also have the option of Inserting the Google +1 button into the Sidebar. A Standard size button.
Edit Sidebar > Add a Sidebar item > Choose a page Element > +1 Button