Google has started rolling out it’s Plus one button for webmasters just following yesterday’s release of the Twitter follow button that you can embed in your website. To create a custom +1 button you have to first visit here. Once you arrive at the website you are able to select one of 4 button sizes, and select your language (Only US English works).
You can see a live preview on the right side on how the button will look on your website. The 4 button sizes are 15px, 20px,24px and 60px.
Advanced +1 Button Options
How to Tag Plus One Clicks with Google Analytics
One smart way to get data on clicks before Google rolls out an official solution is to check out Yoast who has created a simple guide on Tracking Google +1 button as an event in Google Analytics. I’ve just added it to this site and should hopefully start gathering data soon.
Do all my pages need to have a rel=”canonical” tag?
No, though we recommend it, Google will next look for the rel=”canonical” tag on the page. If that isn’t found, Google will use the document.location.href. This final value can sometimes be misleading because of state variables often kept in the URL. So they advise using a rel=”canonical” tag can help you specify the exact URL you want +1
Will the +1 work on a private URL?
No, the +1 button won’t work. +1′s only work for public URLs.