When a webpage/URL is shared on Google+ basic information is pulled from the webpage.
Example view of someone sharing a link in Google Plus:
At present rather than using anything too funky like Facebook’s Open Graph Protocol, Google takes all the information needed from standard meta / html on the web page.
Title and description
The title and meta description are used for the G+ link title and description text.
If there is no meta description then Google pulls text from the page.
The user can adjust the description text in Google+.
The website favicon is pulled in when a link is shared on Google+.
If your site doesn’t have a favicon already you may want to get one.
Google attempts to pull accessible images from the page.
If there is more than one the user can flick through to choose the most suitable.
If you have your website logo in an easily accessible place (ie. not as a div background in CSS) Google should pick this up for a basic thumbnail for all your pages, which will probably increase click-throughs to your links.
Placing a Google +1 button in visible locations on your pages should increase the amount of times a page is shared.
Obvious spots to place the button would be before and/or after page content.
The following pages may be useful for more information on Google+ and the +1 button:
- Google +1 Button section @ Google Webmaster Help Forum
- Google +1 page for webmasters @ Google.com (get the button code here)
- Google +1 documentation @ Google Code
- Alex Moss @ Pleer has released a WordPress +1 button plugin
- Social Plugin Tracking in Google Analytics @ Google Analytics Blog
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